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Flashcards in Chapter 11 Deck (12):
1

What is the difference between a bridge and a switch?





338

- a switch is a hardware device that filters and forwards network packets, but often not capable of much more.
-a bridge is a device that connects two local-area networks (LANs), or two segments of the same LAN. Unlike a router, bridges are protocol -independent. They forward packets without analyzing and re-routing messages. switches uses application specific integrated circuit ( ASICs)

2

what is the reason of having bridges and switches?
338

the reason of having switches and bridges is to to break up collision domains.

3

both switches and bridges forward layer 2 broadcasts. T/F
340

True

4

bridges are software based and switches are hardware based. T/F
340

True

5

what are the 3 switches functions at layer 2?
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-Address learning
-forward/filter decisions
-loop avoidance

6

Spanning Tree Protocol:



346

STP is a networking protocol. It creates a single path over a network, preventing any loops from occurring, even if there are multiple paths to the same destination.
in another word STP is a layer 2 protocol that is used to maintain a loop free switched network.

7

the IEEEE has its own version of STP, what is it?
346

802.1D

8

by default most switches run on 802.1D version of STP. T/F
346

true

9

this is a new vestion of STP, it is faster then 802.1D and is not enable by default on any switches/
346

DEC version.

10

What is Broadcast Storm?







346

A state in which a message that has been broadcast across a network results in even more responses, and each response results in still more responses in a snowball effect. A severe broadcast storm can block all other network traffic, resulting in a network meltdown. Broadcast storms can usually be prevented by carefully configuring a network to block illegal broadcast messages.

11

The ports on a switch with enabled Spanning Tree Protocol (STP) are in one of the following five port states:



347

• Blocking
• Listening
• Learning
• Forwarding
• Disabled

12

what is BPDUs?


347

Short for Bridge Protocol Data Unit, BPDUs are parts of the spanning tree protocol that help describe and identify attributes of a switch port. BPDUs allow for switches to obtain information about each other.