A

senior network administrator requires you to map the Remote Branch Office

network and discover the name of a recently installed switch that still needs

an IP address to be configured. Your task is to create a map of the branch

office network. You must record all of the network device names, IP addresses

and subnet masks, and physical interfaces interconnecting the network devices,

as well as the name of the switch that does not have an IP address.

To

map the network, you will use SSH for remote access and the Cisco Discovery

Protocol (CDP) to discover information about neighboring network devices.

Because CDP is a Layer 2 protocol, it can be used to discover information about

devices that do not have IP addresses. You will record the gathered information

to complete the Addressing Table and provide a topology diagram of the Remote

Branch Office network.

The

local and remote administrative usernames and passwords are:

Local Network

Username: admin01

Branch Office Network

Username: branchadmin

Download the lab file from HERE

and do the lab tasks in the Packet Tracer activity. When ready, submit the configured activity

in the next page.

• In the User Profile prompt, change the Guest name to you own name and click OK.  If you missed the prompt, you can always check/change the profile name from Options --> User Profile menu.  Don’t do the lab as a Guest! The lab will not be evaluated (=the result is 0%) if the profile name doesn’t match your name!
• In the beginning, your completion is 0% (the score can be found in the PT Activity window, check the Packet Tracer icon in the Windows Taskbar, note that you can select Top/Dock

   to keep the score visible

  all the time, if you prefer). Follow the instructions below to make device configurations and your completion score will increase. At the end, if you have done everything correctly, the score will be 100%.

• Recommendation: save your work (CTRL+S) regularly to avoid losing information in case of problems.

Part 1: Use SSH to Remotely Access Network Devices

In Part 1, use the Admin-PC to remotely access the Edge1 gateway router. Next, from the Edge1 router you will SSH into the Remote Branch Office.

On the Admin-PC, open a command prompt.

SSH into the gateway router at 192.168.1.1 using the username admin01 and the password S3cre7P@55.

PC> ssh –l admin01 192.168.1.1

Note: Notice that you are placed directly into privileged EXEC mode. This is because the admin01 user account is set to privilege level 15.

Use the show ip interface brief and show interfaces commands to document the Edge1 router’s physical interfaces, IP addresses, and subnet masks:

• S0/0/0: IP Address: Subnet mask: 

From Edge1, use SSH to access the Remote Branch Office at 209.165.200.10 with the username branchadmin and the same password as above. What is the router hostname?  

Part 2: Use CDP to Discover Neighboring Devices

You are now remotely connected to the Branch-Edge router. Using CDP, begin looking for connected network devices.

Issue the show ip interface brief and show interfaces commands to document the Branch-Edge router’s network interfaces, IP addresses, and subnet masks. Fill the missing details to the table:

Security best practice recommends only running CDP when needed, so CDP may need to be turned on. Use the show cdp command to display its status.

Branch-Edge# show cdp

You need to turn on CDP, but it is a good idea to only broadcast CDP information to internal network devices and not to external networks. To do this, turn on the CDP protocol and then disable CDP on the S0/0/1 interface.

Branch-Edge# configure terminal

Issue a show cdp neighbors command to find any neighboring network devices.

Note: CDP will only show connected Cisco devices that are also running CDP.

Is there a neighboring network device? 

Note: It may take some time for CDP updates to be received. If you see no output from the command, press the Fast Forward Time button several times.

To find the IP address of the neighboring device use the show cdp neighbors detail command and record the IP address: 

Note that aside from the neighboring device’s IP address, you can see for example the neighboring device’s IOS software version. This could be a potential security vulnerability if it is known by a threat actor.

Now that you know the IP address of the neighbor device, connect to it with SSH in order to discover other devices that may be its neighbors.

After successfully connecting with SSH, what does the command prompt show? 

You are now remotely connected to the next neighbor. Use the show cdp neighbors command, and the show cdp neighbors detail command, to discover other connected neighbor devices. Fill the missing details to the table:

What is the neighboring switches IP address?

Continue discovering new network devices using SSH and the show CDP commands. Eventually, you will reach the end of the network and there will be no more devices to discover.

What is the hostname of the switch that does not have an IP address on the network?