CISCO

Monday, 2 March 2020

March 02, 2020

Question and Answer in DHCP

Question and Answer in DHCP

My Dear Friend in today’s article, I will tell you “Question and Answer in DHCP” If you any problem after reading in this article, you can see the video below. Please don't forget to Like, Share, Comment & Subscribe to our Networking Guruji Channel for more video.


Question and Answer in dhcp

What is DHCP

DHCP is Dynamic Host Configuration Protocol. Provides an automatic IP address to a client.

What are the advantages of using DHCP

DHCP removes the process of manual configuration of the IP setting.
DHCP is useful for mobile devices.

What are the components of DHCP

DHCP client and DHCP Server.

Describe DORA process

The DHCP Process uses four messages between the client and server to lease an IP address.

Discover: - From client to server to discover the server.

Offer: - From server to client to offer to lease an IP address and other parameters.

Request: - From client to server to lease the IP address sent by server.

Acknowledgment: - From server to client to assign the address.

What is the source and destination IP addresses are used in the DHCP Discover process by the client

Source IP is 0.0.0.0 and destination IP is 255.255.255.255

What is the function of IP helper-address

It is used to find the DHCP server which is the indifferent subnet of the client.

What information is sent by DHCP server generally

IP and Subnet mask
Default Gateway
DNS Server IP

interview questions and answers on dhcp

What is DHCP relay

The Process by which router relays the DHCP messages by Changing the IP address in the packet header is known as DHCP relay.

What is DHCP conflict

If a host is statically configured with an IP address which is also in DHCP pool, both DHCP server and client try to detect this type of problem known as conflicts.

How does conflict be detected

The DHCP server uses ping before lease an IP address to a client.
DHCP client uses ARP before using an offered an IP address from a DHCP server.

What is APIPA

On the network but the client devices are configured to use DHCP for their IP address configuration. APIPA allows the client device to randomly choose one of the 65,534 address available in the Class B network address of 169.254.0.0/16

Conclusion

Full article “Question and Answer in DHCP” Thank you for the full reading of the article. If you find this post helpful, then help others by sharing it on social media.

Tuesday, 18 February 2020

February 18, 2020

OSI Model Interview Questions and Answers CCNA

OSI Model Interview Questions and Answers CCNA


My Dear Friend in today’s article, I will tell you “OSI Model Interview Questions and Answers CCNA” If you any problem after reading In this article, you can see the video below. Please don't forget to Like, Share, Comment & Subscribe to our Networking Guruji Channel for more video.
OSI Model Interview Questions and Answers CCNA

Previous Topics:- ACL Interview Questions and Answers in CCNA

What is the network model

Network Model is a set of documents where each document defines a network function (protocols, physical requirements).

Give some examples of the network model

OSI model, TCP/IP model, SNA model.

Why do we need model

Networking models are easy to understand, describe and analyze data communications.

What is the full form of DoD Model

DoD stands for the Department of Defense.

What are the layers of the TCP/IP model

TCP/IP model has originally 4 layers, but an updated version, it has 5 layers.
Application or Process Layer
Transport or Host-to-Host Layer
Network or Internet Layer
Link or Network Access Layer
Physical Layer

What are the layers of the OSI model

OSI model has 7 layers.
Layer7: Application
Layer6: Presentation
Layer5: Session
Layer4: Transport
Layer3: Network
Layer2: Data Link
Layer1: Physical

What is the function of Application Layer

The application layer is the closest to the end-user. It is giving space to use to interact with Software or Application.

Give some examples of protocols of application layer

HTTP, HTTPS, POPv3, SMTP, FTP, TFTP, SNMP, TELNET, SSH, BGP, DHCP, DNS, NTP.

What is the function of the Transport layer

This layer is responsible for how Data will be delivered and defines well-known ports.

Which is the protocols of the Transport layer

TCP or Transmission Control Protocol
UDP or User Datagram Protocol

osi layer and tcp ip layer interview questions and answers 


What is the difference between TCP and UDP

TCP                                                            
Header Size is 20 byte
Slow down process
FTP, HTTP, Telnet, DNS, etc use TCP
Connection oriented protocol

UDP
Header Size 8 Bytes
Faster than TCP
Used by DHCP, DNS, real-time services.
Connectionless protocol 


What is port numbers in the Transport layer

Port number defines every session uniquely by a decimal value in Transport Layer. This is logical Port numbers is used to identify the application.

What is the function of ports at Transport layer

Port numbers are used to differentiate the sessions and identifies the application.

Which are well-known port numbers

0-1023 are well-known ports.

What is the range of port numbers

0-65535.

Give some example of port numbers with their services

FTP Data: TCP: 20
FTP Control: TCP: 21
SSH: TCP: 22
Telnet: TCP: 23
SMTP: TCP: 25
DNS: TCP/UDP: 53
DHCP Server: UDP: 67
DHCP Client: UDP: 68
TFTP: UDP: 69
HTTP: TCP: 80
POPv3: TCP: 110
SNMP: UDP: 161
SSL: TCP: 443
Sys Log: UDP: 514

Which service does use both TCP and UDP at transport layer protocol

DNS

What is the function of the Internet/Network layer

Routing Protocol and Routed protocol works here.

Which devices are used at Internet layer

Router, Layer3 switch. 

tcp -ip model

What is the function of the Data Link layer

Provides services to the upper layer.
Defines hardware and protocols to deliver data across the physical network/link.

What are the protocols and devices of Data Link Layer

Protocols are Ethernet, Token Ring, FDDI, HDLC, PPP, etc.
Devices used in this layer are Switch, Bridge.

What is the function of the Physical layer

The physical layer function is related to the physical transmission of data. Like speed, duplex, hardware, etc.

Give some examples of physical layer devices

HUB, Modem, Repeater

What is the function of Presentation and Session layers

Presentation Layer:
Negotiates data format, such as ASCII for text and JPEG for an image.
Encrypts data, compress data.
Session Layer:
Starts maintain, ends a network session.

What is PDU

PDU stands for Protocol Data Unit. A generic term for data at each layer in the OSI model.

What is the PDU of different layers of the OSI model

Application: Data
Presentation: Data
Session: Data
Transport: Segment
Network: Packet
Data Link: Frame
Physical: Bits

What do you mean by Encapsulation and De-Encapsulation

Encapsulation is adding a header or trailer to the data
De-encapsulation is removing and discarding the header and trailer from the data.

 What is TCP 3-way handshaking

TCP session establishment process between 2 hosts. It is a 3-way process in which each host responds with an SYN and ACK message to each other. This process is known as TCP 3-way handshaking process.

what is osi model in networking



What is TCP Flow Control

Flow Control is a process to control the data flow between Sender and Receiver.

What is TCP Windowing

How many data can be sent at a time before waiting for an acknowledgment.

What is the LLC layer

The LLC (Logical Link Control) a layer will determine what protocol is being used and ports for the upper layer (Network Layer) processing, it also does error checking.


Conclusion

Full article “OSI Model Interview Questions and Answers CCNA” Thank you for the full reading of the article. If you find this post helpful, then help others by sharing it on social media.

Monday, 17 February 2020

February 17, 2020

ACL Interview Questions and Answers in CCNA

ACL Interview Questions and Answers in CCNA

My Dear Friend in today’s article, I will tell you ACL Interview Questions and Answers in CCNA If you any problem after reading this an article, you can see the video below. Please don't forget to Like, Share, Comment & Subscribe to our Networking Guruji Channel for more videos.

ACL Interview Questions and Answers in CCNA

What is ACL

The Cisco Access Control List (ACL) is used for filtering traffic based on some given filtering criteria applied on a router or switch interface.

What are different ACL types

Standard ACL
Extended ACL
Both ACL can be implemented in two different ways,
Using Number, which is called “Numbered ACL”
Using name, which is called “Named ACL”

What is the range of Standard numbered ACL

1 – 99 and 1300 - 1999

What is the range of Extended numbered ACL

100 – 199 and 2000 - 2699

What ACL direction

It defines the direction of traffic, incoming to an interface or outgoing from an interface.

What is implicit deny

Every ACL has a default deny statement (implicit deny) at end of it.
If a packet does not meet with any condition, it will be destroyed (by the last deny condition).

How Extended ACL filters traffic

address, destination address, l4 port number, protocol and much more.

How standard ACL filters traffic

Standard ACL are used for normal filtering. Standard ACLs filter the packed based on source IP packet.

What is the advantage of named ACL over Numbered ACL

Easy to identify and remember.
Easy to edit, add or delete lines.

Can ACL filters traffic originated from routers

NO

Access Control List Interview Questions
    Conclusion

 Full article “ACL Interview Questions and Answers in CCNA” Thank you for the full reading of the article. If you find this post helpful, then help others by sharing it on social media.

Monday, 10 February 2020

February 10, 2020

CCNA STP Interview Questions and Answer

CCNA STP Interview Questions and Answer.

My Dear Friend in today’s article, I will tell you CCNA STP Interview Questions and Answer If you any problem after reading this article, you can see the video below. Please don't forget to Like, Share, Comment & Subscribe to our Networking Guruji Channel for more videos.

CCNA STP Interview Questions and Answer


What is STP or What is the purpose of STP?



STP stands for Spanning Tree Protocol. Spanning-tree protocol (STP) is used to prevent a loop in the Layer 2 switching network by logically blocking redundant links.

What is the layer 2 loop?

The process of forwarding a single frame around and around among switches is known as a layer 2 loop.

 Why does a frame stuck in a layer 2 loop forever?

Because in layer 2 header there is no field that can prevent loop like TTL field in a layer 3 header. As a result, when layer frames stuck in a loop it goes for ever. 

How does STP remove the loop?

STP uses Spanning Tree Algorithm, and finds redundant links in Switch Network and put into a blocking state. 

What is BPDU? What is its purpose?

BPDU or Bridge Protocol Data Units a type of STP message which switches use to exchange information of each other. BPDU contains information that help the switch to determine the topology. BPDU is sent in every 2 Sec.

What are the different types of BPDU?

Configuration BPDU or Hello BPDU, used for spanning tree topology or instance calculation.
Topology Change Notification (TCN) BPDU, used to announce the information about the changes in a network topology.


Why do we need a root switch in a layer 2 network?


   For all switches in a network to agree on a loop-free topology, there must be a switch that can be used as a guide.

How does a root switch is elected?

    BPDU contains a field. Each Switch has a unique identifier which is called  Bridge ID or Switch ID, an 8-byte value (2 byte priority field and 6-byte system ID, system ID is the universal unique MAC address of each switch)
    Switch with the best (numerically lower) Switch ID or Bridge ID in a layer 2 topology is called the root switch.
    Priority comes first, if it ties then MAC address is used to select root switch.

“Interview Questions and Answers on stp”

Interview Questions and Answers on stp

What is the root port?

Each (non-Root) the switch has exactly one Root Port, which represents the best path (lowest path cost) to the Root switch.


What is a designated port?

The designated port (DP) on a link in the port, from which the link gets the best (least cost) Hello/BPDU onto a link during STP convergence. 
All ports of root switch are designated port.
Port is in always forwarding state.



What is non-designated port?

The ports those are neither root port nor designated port.
These ports are blocked by STP, known as blocked port.




What is the method of selecting a root port?

Total Path Cost to Root Bridge  - lowest is best.
In case of a tie, Connected Bridge ID - lowest is best.
Connected switch’s Port ID (Port Priority.Port Number) - lowest is best.
Local Port number - lowest is best.

What are the different states of ports in STP?

Blocking
Listening
Learning
Forwarding
Disabled

What is Hello Timer in STP?

The time interval between Configuration BPDUs sent by the Root Bridge. The default Hello,Time value is of 2 seconds.


What is Forward Delay Timer in STP?

The time interval that a switch port spends in both the Listening and Learning states. The default value is 15 seconds.

What is the Max-Age Timer?

The time interval that a switch stores the best BPDU it has received before discarding it.

What is the actual convergence time in STP (PVST)?

Near about 50 to 52 seconds theoretically.
Practically 32 to 35 sec.

What are the different flavors/types of STP?

CST
PVST
PVST+

What is CST?

A common instance of Spanning Tree, it is basically use a single instance calculation for all VLAN.

What is PVST?

Per VLAN Spanning Tree, it is Cisco Proprietary and calculates instance for each and every VLAN.

What is PVST+?

Cisco made the PVST as per IEEE standard (802.1d) and given the name PVST+ (802.1d).

“STP Interview Questions and Answers”

What are the disadvantages in CST?

Redundant links between switches will be blocked with no capability for load balancing. Conditions also can occur that would cause CST to mistakenly enable forwarding on a link that does not carry a specific VLAN, while other links would be blocked.

What do you mean by topology change in a layer 2 network?

A  topology change occurs when a switch port either moves from blocking state to Forwarding state or moves from Forwarding state to the Blocking state.


What does Port Fast do?

Port Fast immediately brings an interface configured as an access or trunk port to the forwarding state from a blocking state, bypassing the listening and learning states.

What is the advantage of Port Fast?

In case of change of state of a port fast enabled port no TCN BPDU is sent by the switch.

STP Interview Questions and Answers
What is the BPDU Guard?

BPDU a guard is access port security features. If BPDU received by BPDU guard enabled port then the port will go to error disable state.

Can we enable PortFast on Trunk port?

-         Yes we can if the port is connected to Server.

   Conclusion

    Full article “CCNA STP interview questions and answer” Thank you for the full reading of the article. If you find this post helpful, then help others by sharing it on social media.

Tuesday, 4 February 2020

February 04, 2020

Configuring basic VTP on CISCO Switches


Configuring basic VTP on CISCO Switches

My Dear Friend in today’s article, I will tell you “Configuring basic VTP on CISCO Switches” If you any problem after reading this article, you can see the video below. Please don't forget to Like, Share, Comment & Subscribe to our Networking Guruji Channel for more video.

Configuring basic VTP on CISCO Switches
Scroll Down for Details Video VTP

"Configuring basic VTP on CISCO Switches” VTP is VLAN Trunking Protocol, it makes easier of VLAN management in L2 switches. It is actually replicating VLAN from server mode switch to all client mode switches.

NOTE: - It is not a broadcast domain.

VTP packets are sent in either inter-switch link (ISL) frames or IEEE 802.1q (dot1q) frames. These packets are sent to the destination MAC Address 01-00-0C-CC-CC-CC with a logical link control (LLC) code of subnetwork Access Protocol (SNAP)

There are three different modes of VTP (VLAN Trunking Protocol)

Server
Client
Transparent

Server Mode: - This is the default mode of Cisco Switches. In this mode, you can create, modify and remove VLAN. It is also can generate a VTP update message and if it receives an update from other server switches then it can install a VTP update in its VLAN database, actually, it can change its own VLAN database.

Client Mode: - In this mode you cannot add, remove or modify VLAN, it can receive the update from server switch, once receive it will change/update its own VLAN database, then can pass the update over the trunk port if any other switches are connected.

Transparent Mode: - VTP Transparent switches do not participate in VTP. A VTP transparent switch does not advertise its VLAN Configuration and does not synchronize its VLAN configuration based on received advertisement, but transparent switches do forward VTP advertisements that they receive out their trunk port.


VLAN Trunking Protocol (VTP)

“VLAN Trunking Protocol (VTP)” There are three different versions VTP. VTP protocol version: 1, 2 and 3. VTP V3 not covered in CCNA Syllabus. New CCNA (200-301) Syllabus totally removed VTP.

VTP V2 is not much different than VTP V1. The Major difference is that VTP V2 introduces support for token ring VLANs. If you use Token Ring VLANS, you must enable VTP V2. Otherwise, there is no reason to use VTP V2. Changing the VTP Version from 1 to 2 will not cause a switch to reload.

“VTP Configuration – Revision Cisco Switch”

Configuration Revision Number

 Sequence the number for the database
 Highest number wins
A domain is synchronized when revision number matches
 everywhere

Potential problems in VTP

 Wrong database with a high configuration revision number
  can overwrite the database
  True for both VTP servers and clients
  Reason that VTP v1/v2 is rarely used in production

How we can make Revision number 0

Change the switch mode to Transparent
 Delete vlan.dat file and reload the switch
Change the VTP domain name.

What will you check before connecting a switch to a running network?

I will make configuration revision number “0” before I connect a switch to running network.

VTP Configuration – Revision Cisco Switch

 “VTP Authentication – CCNA”

Used for validation of VTP updates

- Configuring / Verifying VTP password

          show vtp password

           show vtp status

           compare MD5 hashes

NOTE: - Switch to switch link must be a trunk to propagate/replicate VLAN information or VTP Update.


“Configure VTP in CISCO Switches”

Configure all inter-switch link on SW-1, SW-2, and SW-3 in Dynamic desirable mode.

Configure all inter-switch link on SW-4 in Dynamic auto mode
Configure SW-1 as VTP Server mode and VTP domain CCNA

Configure SW-2, SW-3, and SW-4 as VTP Client and VTP domain CCNA
Configure VLAN ID 10,20 and 30 SW-1

Assign VLAN ID 10 SW-3 port Fa0/1 and assign VLAN ID 20 on SW-3 port FA0/4

Assign VLAN ID 10 SW-4 port Fa0/1 and assign VLAN ID 20 on SW-4 port FA0/4

Configure IP as bellow on PC’s

PC -1 = 172.16.10.1/24
PC -2 = 172.16.20.2/24
PC -3 = 172.16.10.2/24
PC -4 = 172.16.20.2/24

Test Ping from PC-1 to PC-3 and test ping from PC-2 to PC-4

Configure VTP in CIsco Switches


 SW-1
We are using Interface range command to configure Fa0/1 and Fa0/2 at the Same time.

Sw-1(config)#Interface range FastEthernet 0/1-2
SW-1(config-if-range)#switchport mode dynamic desirable
Sw-1(config)#vtp mode server
Sw-1(config)#vtp domain CCNA
Sw-1(config)#vlan 10
Sw-1(config)#exit
Sw-1(config)#vlan 20
Sw-1(config)#exit
Sw-1(config)#vlan 30
Sw-1(config)#exit

SW-2
We are using Interface range command to configure Fa0/1 and Fa0/2 at the Same time.

Sw-2(config)#Interface range fatstethernet 0/1-2
SW-2(config-if-range)#switchport mode dynamic desirable
Sw-2(config)#vtp domain CCNA
Sw-2(config)#vtp mode server

SW-3
We are using Interface range command to configure Fa0/1 and Fa0/2 at the Same time.

Sw-3(config)#Interface range FastEthernet 0/1-2
SW-1(config-if-range)#switchport mode dynamic desirable
Sw-2(config)#vtp domain CCNA
Sw-2(config)#vtp mode client
SW-3(config)#interface fastethernet 0/3
SW-3(config-if)#switchport access vlan 10
SW-3(config-if)#interface fastethernet 0/4
SW-3(config-if)#switcport access vlan 20

SW-4

We are using Interface range command to configure Fa0/1 and Fa0/2 at the Same time.

Sw-1(config)#Interface range fatstethernet 0/1-2
SW-1(config-if-range)#switchport mode dynamic auto
SW-1(config)#vtp domain CCNA
Sw-2(config)#vtp mode client
SW-4(config)#interface fatsethernet 0/3
SW-4(config-if)#switchport access vlan 10
SW-4(config-if)#interface fastethernet 0/4
SW-4(config-if)#switchport access vlan 20

First check trunk link between switches to make sure that VTP update message can replicate throughout the L2 switching network.

SW-1#show interfaces trunk

Port        Mode        Encapsulation        Status         Native Vlan
Fa0/1     desirable     n-isl                         trunking              1
Fa0/2      desirable     n-isl                         trunking              1

Port         Vlans allowed on trunk
Fa0/1                    1-1005
Fa0/2                     1-1005

Port         Vlans allowed and active in management domain
Fa0/1          1,10,20,30
Fa0/2           1,10,20,30

Port        Vlans in spanning tree forwarding state and not pruned
Fa0/1               1,10,20,30
Fa0/2                 1,10,20,30

SW-2#show interfaces trunk

Port        Mode        Encapsulation        Status         Native Vlan
Fa0/1     desirable     n-isl                         trunking              1
Fa0/2      desirable     n-isl                         trunking              1

Port         Vlans allowed on trunk
Fa0/1                    1-1005
Fa0/2                     1-1005

Port         Vlans allowed and active in management domain
Fa0/1          1,10,20,30
Fa0/2           1,10,20,30

Port        Vlans in spanning tree forwarding state and not pruned
Fa0/1               1,10,20,30
Fa0/2                 1,10,20,30

VTP Configuration

 SW-3#show interfaces trunk

Port        Mode        Encapsulation        Status         Native Vlan
Fa0/1     desirable     n-isl                         trunking              1
Fa0/2      desirable     n-isl                         trunking              1

Port         Vlans allowed on trunk
Fa0/1                    1-1005
Fa0/2                     1-1005

Port         Vlans allowed and active in management domain
Fa0/1          1,10,20,30
Fa0/2           1,10,20,30

Port        Vlans in spanning tree forwarding state and not pruned
Fa0/1               1,10,20,30
Fa0/2               1,10,20,30

SW-4#show interfaces trunk

Port        Mode        Encapsulation        Status         Native Vlan
Fa0/1     auto            n-isl                         trunking              1
Fa0/2     auto            n-isl                         trunking              1

Port         Vlans allowed on trunk
Fa0/1                    1-1005
Fa0/2                     1-1005

Port         Vlans allowed and active in management domain
Fa0/1          1,10,20,30
Fa0/2           1,10,20,30

Port        Vlans in spanning tree forwarding state and not pruned
Fa0/1                  none
Fa0/2                 1,10,20,30

Now we will verify the VTP configuration. Let’s start from SW-1

SW-1#Show vtp status

VTP Version                                                 2
Configuration Revision                              12
Maximum VLAN’s supported locally       255
Number of existing VLAN’s                        8
VTP operating Mode                                 Server
VTP Domain Name                                    CCNA
VTP Pruning Mode                                    Disabled
VTP V2 Mode                                             Disabled
VTP Traps Generation                              Disabled
MD5 digest                         0xF7 0xB6 0x8d 0x7D 0x61 0xA0 0xF0
Configuration last modification by 0.0.0.0 at 3-1-93 01:15:21
Local updater ID is 0.0.0.0 (no valid interface found)

SW-2#Show vtp status

VTP Version                                                 2
Configuration Revision                              12
Maximum VLAN’s supported locally       255
Number of existing VLAN’s                        8
VTP operating Mode                                 Client
VTP Domain Name                                    CCNA
VTP Pruning Mode                                    Disabled
VTP V2 Mode                                             Disabled
VTP Traps Generation                              Disabled
MD5 digest                         0xF7 0xB6 0x8d 0x7D 0x61 0xA0 0xF0
Configuration last modification by 0.0.0.0 at 3-1-93 01:15:21

SW-3#Show vtp status

VTP Version                                                 2
Configuration Revision                              12
Maximum VLAN’s supported locally       255
Number of existing VLAN’s                        8
VTP operating Mode                                 Client
VTP Domain Name                                    CCNA
VTP Pruning Mode                                    Disabled
VTP V2 Mode                                             Disabled
VTP Traps Generation                              Disabled
MD5 digest                         0xF7 0xB6 0x8d 0x7D 0x61 0xA0 0xF0
Configuration last modification by 0.0.0.0 at 3-1-93 01:15:21

SW-4#Show vtp status

VTP Version                                                 2
Configuration Revision                              12
Maximum VLAN’s supported locally       255
Number of existing VLAN’s                        8
VTP operating Mode                                 Client
VTP Domain Name                                    CCNA
VTP Pruning Mode                                    Disabled
VTP V2 Mode                                             Disabled
VTP Traps Generation                              Disabled
MD5 digest                         0xF7 0xB6 0x8d 0x7D 0x61 0xA0 0xF0
Configuration last modification by 0.0.0.0 at 3-1-93 01:15:21

From the above output, we can see SW-1 is in VTP server mode and SW-2, SW-3 and SW-4 is in VTP client mode. Also, all the switches have VTP domain name CCNA. Number of Existing VLAN we can see in all switches 8, where all the switches had a total number of default VLAN 5 (VLAN ID 1 and VLAN ID 1002 to 1005). We have created three VLAN (VLAN ID 10,20 and 30) in SW-1.
SW-1 has replicated newly created three VLAN’s to SW-2, SW-3, and SW-4, Now all switches have total VLAN’s 8 (Default VLAN 5 + newly created 3) = 8

Extra Part: Transparent Mode Configuration

Any switch configuration in the diagram.

SW-3, SW-4

Sw-4(config)#vtp mode transparent

Just 1 command apply to transparent mode in VTP

Now we will see the VLAN database on all four switches.

SW-1#show vlan brief

VLAN             Name                             Status                                Ports

1                     default                             active                          Fa0/3 to Gi0/2
10                 VLAN0010                       active
20                 VLAN0020                       active
30                 VLAN0030                       active
1002   fddi-default                                active
1003   token-ring-default                     active
1004   fddinet-default                           active
1005   trnet-default                                active

SW-2#show vlan brief

VLAN             Name                             Status                                Ports

1                     default                             active                          Fa0/3 to Gi0/2
10                 VLAN0010                       active
20                 VLAN0020                       active
30                 VLAN0030                       active
1002   fddi-default                                active
1003   token-ring-default                     active
1004   fddinet-default                           active
1005   trnet-default                                active

SW-3#show vlan brief

VLAN             Name                             Status                                Ports

1                     default                             active                          Fa0/5 to Gi0/2
10                 VLAN0010                       active                            Fa0/3
20                 VLAN0020                       active                            Fa0/4
30                 VLAN0030                       active
1002   fddi-default                                active
1003   token-ring-default                     active
1004   fddinet-default                           active
1005   trnet-default                                active

SW-4#show vlan brief

VLAN             Name                             Status                                Ports

1                     default                             active                          Fa0/5 to Gi0/2
10                 VLAN0010                       active                            Fa0/3
20                 VLAN0020                       active                           Fa0/4
30                 VLAN0030                       active
1002   fddi-default                                active
1003   token-ring-default                     active
1004   fddinet-default                           active
1005   trnet-default                                active

In show VTP the status output we can see configuration Revision Number, a configuration revision number is a 32-bit number that indicates the level of revision for the VTP packet. It is nothing but sequence number of VTP update used to keep track of VTP update. Each time the VTP server sends an update it includes configuration Revision number and incremented by one. If you see configuration revision number the same in all switches in the same VTP domain, that means The VTP update was synchronized and good to go.

VTP Configuration - Cisco Switch
Now we will do the ping test

PC-1

PC>ping 172.16.10.2

Pinging 172.16.10.2 with 32 bytes of date
Reply from 172.16.10.2: bytes=32 time=2ms TTL=128
Reply from 172.16.10.2: bytes=32 time=2ms TTL=128
Reply from 172.16.10.2: bytes=32 time=2ms TTL=128
Reply from 172.16.10.2: bytes=32 time=2ms TTL=128

Ping statistics for 172.16.10.2

Packets: sent =4, Received =4, Lost = 0 (0% loss)
Approximate round trip times in milli-seconds;
Minimum =0ms, Maximum = 2ms, Average =0ms

PC-2

PC>ping 172.16.20.2

Pinging 172.16.20.2 with 32 bytes of date

Reply from 172.16.20.2: bytes=32 time=2ms TTL=128
Reply from 172.16.20.2: bytes=32 time=2ms TTL=128
Reply from 172.16.20.2: bytes=32 time=2ms TTL=128
Reply from 172.16.20.2: bytes=32 time=2ms TTL=128
Ping statistics for 172.16.20.2

Packets: sent =4, Received =4, Lost = 0 (0% loss)
Approximate round trip times in milli-seconds;
Minimum =0ms, Maximum = 11ms, Average =2ms

Or more Information VTP step by step configuration, Server, Client, Transparent.


Conclusion

Full article “Configuring basic VTP on CISCO Switches” Thank you for the full reading of the article. If you find this post helpful, then help others by sharing it on social media.