Lammle - Chapter 8

Question 1

Collision Domain

Answer 1

Network segment with two or more devices sharing the same bandwidth

Question 2

___ & ___ break collision domain

Answer 2

Bridges and switches

Question 3

Bridge / Switch - 3 Differences?

Answer 3

1. Bridges are software based. Switches are hardware based (ASIC).
2. Switches have a much larger number of available ports than bridges.
3. One bridge - one spanning-tree. One switch- multiple spanning-trees

Question 4

Bridge / Switch - 3 Commonalities?

Answer 4

1. Both forward L2 broadcasts
2. Both learn MAC addresses by examining the src address of each frame
3. Both make forwarding decisions based on L2 addresses

Question 5

3 Switch Funtions at layer 2

Answer 5

Address learning, forward/filter decisions, loop avoidance.

Question 6

When does a hub flood the frame out all ports?

Answer 6

Everytime

Question 7

When does a switch flood the frame out all ports?

Answer 7

Never. It will at least have one MAC address if it received a frame with a src MAC address. If it doesn’t have the dst MAC address, it will flood the ports not populated in the MAC database.

Question 8

Statements to prevent someone from inserting another hub into a port of a switch.

Answer 8

B6-RDC4-CSR-1(config)#int gi1/1
B6-RDC4-CSR-1(config-if)#switchport port-security ?
aging Port-security aging commands
mac-address Secure mac address
maximum Max secure addresses
violation Security violation mode

Question 9

The right way to create a functional bridged network is to make sure that its users spend ___

Answer 9

80% of their time on the local segment.

Question 10

4 ways switching loops cause problems

Answer 10

1. Broadcast storms.
2. Multiple copies of the same frame can arrive from different segments at the same time.
3. Thrashing the MAC table.
4. Multiple loops - loops within loops. Broadcast storms on top of that.

Question 11

IEEE version of STP is 802.??

Answer 11

802.1D

Question 12

In the context of STP, STA stands for ___

Answer 12

Spanning Tree Algorithm

Question 13

A Root Bridge is selected by first looking at ___

Answer 13

The bridge ID. The switch with the best bridge ID is selected.

Question 14

BPDU

Answer 14

Bridge Protocol Data Unit

Question 15

A blocked port [does / does not] forward frames but [does / does not] listen to frames.

Answer 15

does not, does

Question 16

Spanning Tree Terms - BPDU

Answer 16

That’s where we be.