JZTXT

连网技术与网络管理 作业一 vlan间路由实现

发布时间 2023-04-27 18:31:27作者: ChuckLu

PC2 with IP 192.168.10.2 and gateway 192.168.10.1
PC3 with IP 192.168.20.2 and gateway 192.168.20.1
 both of them connect to switch A

PC32 with IP 192.168.10.3 and gateway 192.168.10.1
PC33 with IP 192.168.20.3 and gateway 192.168.20.1
both of them connect to switch B

And switch A connect to switch B

I tried to ping 192.168.20.2 on PC2, why it did not work?

 

Based on the given network topology, PC2 and PC3 are in different IP subnets and are connected to the same switch A. Likewise, PC32 and PC33 are in different IP subnets and are connected to the same switch B. Switch A and switch B are connected to each other.

For PC2 to ping PC3, the following steps need to occur:

  1. PC2 sends a ping request to the IP address of PC3, which is in a different subnet.
  2. Since PC3 is in a different subnet, the packet is sent to the default gateway, which is the IP address of the interface on switch A that is connected to the same subnet as PC2.
  3. Switch A receives the packet from PC2, looks up the destination IP address, and determines that it needs to forward the packet to the default gateway, which is the IP address of the interface on switch A that is connected to the same subnet as PC2.
  4. Switch A forwards the packet to the IP address of the interface on switch B that is connected to switch A.
  5. Switch B receives the packet, looks up the destination IP address, and determines that it needs to forward the packet to the default gateway, which is the IP address of the interface on switch B that is connected to the same subnet as PC3.
  6. Switch B forwards the packet to the default gateway, which is the IP address of the interface on switch B that is connected to the same subnet as PC3.
  7. The default gateway forwards the packet to PC3.

In this case, since PC2 and PC3 are in different subnets and are connected to the same switch A, the ping request from PC2 to PC3 will not be successful, because the switch A is not capable of routing between different subnets. To make it work, you need to configure inter-VLAN routing on switch A or use a router to connect the two subnets.

 

If you want to rename a switch in Cisco Packet Tracer using the command line interface, you can follow these steps:

  1. Open the command prompt on your computer and enter the command "telnet 127.0.0.1" to connect to the local Packet Tracer instance.
  2. Enter the command "enable" to enter privileged EXEC mode.
  3. Enter the command "configure terminal" to enter global configuration mode.
  4. Enter the command "hostname [new hostname]" to change the hostname of the switch to your desired name. Make sure to replace [new hostname] with the name you want to use.
  5. Enter the command "end" to exit global configuration mode.
  6. Enter the command "write memory" to save the changes to the switch's configuration.

Once you have completed these steps, the switch in Cisco Packet Tracer should be renamed to the new hostname you specified.

 

"switchport trunk encapsulation dot1q" is a command used in Cisco IOS (Internetwork Operating System) to set the encapsulation method used for trunk links between switches.

The "dot1q" part of the command refers to the IEEE 802.1Q standard for VLAN tagging, which is a method used to identify VLAN membership for frames being transmitted over a trunk link.

This command should be used on a switch port configured as a trunk, and it specifies that the switch should use the IEEE 802.1Q standard for VLAN tagging on that port.