题目内容

4.7 What is the “bridge ID” of a bridge in a bridged LAN ?

A. (a)6 bytes, MAC address of the bridge
B. (b)8 bytes, priority (2 bytes) + MAC address of the bridge (6 bytes)
C. (c)10 bytes, IP address (4 bytes) + MAC address of the bridge (6 bytes)
D. (d)6 bytes, priority (2 bytes) + IP address of the bridge (4 bytes)

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4.8 Which of the following statements are correct about the ID of a bridge ?

A. (a) The ID is fixed
B. (b) The ID is programmable by setting MAC address
C. (c) The ID is programmable by setting priority value
D. (d) ID 1 > ID 2 if the MAC address of ID 1 > MAC address of ID 2.
E. (e) ID 1 > ID 2 if the priority value of ID 1 > the priority value of ID 2.

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4.10 Let (A) be the procedure to find the root bridge of a BLAN, (B) be the procedure to find the “root port” of a bridge, and (C) be the procedure to find a “designated bridge” of a LAN, (D) be the procedure to find a “designated port” of a LAN. What is the sequential procedure to establish the spanning tree of a BLAN ?

A. (a) A, B, D
B. (b) A, C, B
C. (c) A, C, D
D. (d) B, A, C

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4.12 Which of the following statements about the spanning tree maintenance are correct ?

A. (a) The root bridge will send a “Hello” BPDU periodically to each of its ports.
B. (b) The “Hello” BPDUs are delivered into each of the LANs along the paths of the spanning tree.
C. (c) To have better reliability, each bridge will also forward the “Hello” BDPUs into each of its ports.
D. (d) For the “root bridge”, all it’s ports are “designated ports”.

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4.13 To construct the spanning tree of a BLAN, initially, each bridge assume itself is the “root bridge”, set each of it’s ports as a “designated” port, and send a BPDU to each port with its bridge ID, root bridge ID (itself), and the root path cost of 0. Which of the following statements are correct when a bridge (with root bridge ID = w, rpc = p) receives a BPDU (with root bridge ID = m, rpc =q) from port x ?

A. (a) port x will be selected as a new R port if w ＞ m
B. (b) port x will be selected as a new R port if w = m and p ＞ q
C. (c) port x will be selected as a new R port if p ＞ q
D. (d) port x will be selected as a new R port if w ＜ m

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4.7 What is the “bridge ID” of a bridge in a bridged LAN ?

A. (a)6 bytes, MAC address of the bridge B. (b)8 bytes, priority (2 bytes) + MAC address of the bridge (6 bytes) C. (c)10 bytes, IP address (4 bytes) + MAC address of the bridge (6 bytes) D. (d)6 bytes, priority (2 bytes) + IP address of the bridge (4 bytes)

4.8 Which of the following statements are correct about the ID of a bridge ?

4.12 Which of the following statements about the spanning tree maintenance are correct ?

A. (a)6 bytes, MAC address of the bridge
B. (b)8 bytes, priority (2 bytes) + MAC address of the bridge (6 bytes)
C. (c)10 bytes, IP address (4 bytes) + MAC address of the bridge (6 bytes)
D. (d)6 bytes, priority (2 bytes) + IP address of the bridge (4 bytes)