Homework #4

1. Slide #56 of the BGP PPT presentation shows an example where an eBGP session is set up to the Loopback IP address of another router, rather than to an interface IP address.

a) What advantage is gained from using the Loopback IP as the target of the BGP session rather than an interface IP?

b) The Cisco configuration also shows that 2 static routes are set up on each router.

Why are these static routes required?

2. Describe two important differences between GLBP and HSRP.

3. By default, passwords are displayed unencrypted when a ‘show running-config’ command is run.

What IOS command will cause passwords in the running-configuration file to be encrypted?

4. What IOS command would you type on a router to enforce a requirement that all router passwords must be at least 6 characters long?

5. Why should standard ACLs be placed as close to the destination as possible?

6. Why should extended ACLs be placed as close to the source as possible?

7. Consider the Standard ACL 10 defined in slide #23 of the “Security and ACLs” Powerpoint presentation.

What is the result (either Deny or Permit) of executing this ACL on a packet with each of the following source addresses:






8. Assume Subnet A =, Subnet B =, Host #1 IP = Host #2 IP =

You want to define one Access Control List (ACL) that does all of the following:

Deny all packets from Host #1 to Host #2. Permit any other packets from source subnet A to destination subnet B with destination port 80.

Deny packets from subnet

A to subnet B with any other destination port besides 80. Permit packets from subnet

A to any other destination. Deny all other packets.

a) What are the specific Cisco IOS commands that you would enter to define this Access Control List (ACL)?

b) What Cisco IOS command would you use to apply the ACL you defined in part (a) to all incoming packets on interface Fa0/0?

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Due to various reasons the physical interface can be gone down. But theoretically Loopback interface is not going down at any cost. Therefore, whenever the BGO session is established with Loopback interface IP, though one of the physical layers goes down, the BGP session will be still established if the IP routing reachability is available for the Loop back IP.
To establish BGP session between 2 routers, the IP routing reachability is essential. If there is no IP routing reachability, it cannot be established a BGP session. Hence, to achieve IP reachability between 2 Loopback IPs, the static routes are used. In here 2 routes are...

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