Chapter 11 Flashcards
What is the difference between a bridge and a switch?
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- 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)
what is the reason of having bridges and switches?
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the reason of having switches and bridges is to to break up collision domains.
both switches and bridges forward layer 2 broadcasts. T/F
340
True
bridges are software based and switches are hardware based. T/F
340
True
what are the 3 switches functions at layer 2?
340
- Address learning
- forward/filter decisions
- loop avoidance
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.
the IEEEE has its own version of STP, what is it?
346
802.1D
by default most switches run on 802.1D version of STP. T/F
346
true
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.
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.
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
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.
