• The Internet Book, Chapters 7 through 11 inclusive

1. Why are WANs generally more costly to operate and maintain than LANs?

2. Which US area of the US government was instrumental in providing funding for the precursor to today's Internet?

3. Describe what function the IETF performs.

4. If an Ethernet station attempts to transmit a frame and incurs three consectutive collisions, what is the maximum number of slot times it will wait on it's next (fourth) transmission attempt of the frame?

5. How many bytes (or groups of 8-bits if you prefer) make up a typical Ethernet destination or source address?

6. Describe what a transparent bridge will do when it receives a frame with a broadcast address in the destination address field on one of it's input (ingress) interfaces.

7. Match the term on the left with most appropriate description on the right.

___ 64 bytes	a. Minimum 10/100 Mb/s Ethernet frame size
___ Collision Detection	b. Mostly marketing term for a bridge
___ Spanning Tree	c. IEEE 48-bit broadcast address
___ ff:ff:ff:ff:ff:ff	d. Protocol to ensure loop-free topology
___ LAN switch	e. Part of a shared medium arbitration scheme

8. Using the following diagram, answer the questions below:

Assume hosts 2, 3 and 4 have all sent packets directly to host 1 within the last minute and each has received a reply from host 1. Fill in the missing fields of these bridge address tables.

LAN switch #1

Destination Address	Associated Port
?	port 1
40:00:02:0b:bb:bb	?
40:00:03:0c:cc:cc	port 2
?	?

LAN switch #2

Destination Address	Associated Port
?	port 1
40:00:02:0b:bb:bb	?
40:00:03:0c:cc:cc	port 2
?	?

9. Using the previous diagram, now assume that host #1 transmits frame to host #4 directly. Describe the path the frame will follow and who will see it.

10. There is a Cisco 2950 Ethernet LAN switch in LAN lab room 659. You can remotely access it by visiting telnet://140.192.40.2 in your browser or by typing telnet 140.192.40.2 at a command line. The password is "user" without quotes. Login to the switch and answer the following questions:

• Execute a "show version" command. How many ethernet ports and of what type are available?
• Execute a 'show mac-address-table" command. What are the bridge address table entries associated with Fast Ethernet module 0, port 1 (Fa0/1)?
• Execute a 'show vlan' command. Which ports are members of the default VLAN?
• Enter a 'show interface fa0/1' command. Enter a 'show interface counters' command. Enter a 'show interface status' command. Feel free to explore a bit more. Simply type the '?' key anywhere on the command line for additional commands or for possible command completions.