题目内容

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

查看答案

搜索结果不匹配？点我反馈

更多问题

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”.

查看答案

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

查看答案

4.14 Consider the procedure to construct the spanning tree. When a bridge (with root bridge ID = w, rpc = p) receives a BPDU (with root bridge ID = m, rpc =q) from port x (with a transmission cost of c). Assume w > m. Then what will happen ?

A. (a) Port x will be selected as a new R port.
B. (b) port x will be selected as a new D port.
C. (c) A BPDU with (with root bridge ID = m, rpc =q+c) will be forwarded to all the ports, except port x.
D. (d) A BPDU with (with root bridge ID = m, rpc =q) will be forwarded to all the ports, except port x.
E. (e) A BPDU with (with root bridge ID = m, rpc =p+q) will be forwarded to all the ports, except port x.

查看答案

4.15 Consider the procedure to construct the spanning tree. When a bridge (with root bridge ID = w, rpc = p) receives a BPDU (with root bridge ID = m, rpc =q) from port x (with a transmission cost of c). Assume w ＜ m. Then what will happen ?

A. (a) Port x will be selected as a new R port.
B. (b) The BPDU will be dropped directly.
C. (c) A BPDU (with root bridge ID = w, rpc =p) will be forwarded to port x.
D. (d) A BPDU (with root bridge ID = w, rpc =q+c) will be forwarded to port x.

查看答案

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 ?

4.14 Consider the procedure to construct the spanning tree. When a bridge (with root bridge ID = w, rpc = p) receives a BPDU (with root bridge ID = m, rpc =q) from port x (with a transmission cost of c). Assume w > m. Then what will happen ?

4.15 Consider the procedure to construct the spanning tree. When a bridge (with root bridge ID = w, rpc = p) receives a BPDU (with root bridge ID = m, rpc =q) from port x (with a transmission cost of c). Assume w ＜ m. Then what will happen ?

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