4.6 Which bridge in a bridged LAN will become the “root bridge” of the spanning tree ?
A. (a) The bridge selected randomly
B. (b) The bridge with the largest bridge ID
C. (c) The bridge with the smallest bridge ID
D. (d) The bridge in the “center” of the bridged LAN
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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 ?
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.
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
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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