Which one of the protocols below allows a router to respond to an ARP request destined to a remote host?（）A、Gateway DPB、Reverse ARPC、proxy ARPD、Inverse ARPE、indirect ARP

题目

Which one of the protocols below allows a router to respond to an ARP request destined to a remote host?（）

A、Gateway DP
B、Reverse ARP
C、proxy ARP
D、Inverse ARP
E、indirect ARP

参考答案和解析

正确答案:C

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第1题：

Which of the protocols below use TCP at the transport layer? (Select four)

A. TFTP

B. SMTP

C. SNMP

D. FTP

E. HTTP

F. HTTPS

正确答案：BDEF
B,D,E,F 解析：Explanation:
SMTP (Simple Mail Transfer Profile for email), FTP (File Transfer Protocol), and HTTP/HTTPS (Hyper Text Transfer Protocol for internet) all use TCP because of the reliable delivery mechanism. SMTP uses TCP port 25, FTP uses TCP ports 20 and 21, HTTP uses TCP port 80, and HTTPS uses TCP port 443.

Incorrect Answers:
A, C: SNMP and TFTP use UDP as the transport mechanism. Generally speaking, protocols that use the keywords "trivial" or "simple" uses UDP, since connectionless, best effort delivery mechanism usually suffice.

第2题：

Which one of the protocols below allows a router to respond to an ARP request destined to a remote host?()

A. Gateway DP

B. Reverse ARP

C. proxy ARP

D. Inverse ARP

E. indirect ARP

参考答案：C

第3题：

Which three of the protocols below belong to the application layer? (Select three answer choices)

A. ARP

B. HTTPS

C. SMTP

D. CDP

E. TFTP

F. ICMP

正确答案：BCE
B,C,E 解析：Explanation:
The application layer is the highest OSI layer, and protocols at this layer are end-user oriented. HTTPS so people can get information on the internet, SMTP so people can manage networks, and TFTP so people can download files.

Incorrect Answers:
A, D, F. ARP, CDP, ICMP are protocols that equipment like routers and switches use to communicate with themselves, and belong to lower levels on the model.

第4题：

Which three of the protocols below belong to the application layer?（）

A、ARP
B、HTTPS
C、SMTP
D、CDP
E、TFTP
F、ICMP

正确答案:B,C,E

第5题：

Which of the routing protocols shown below support both VLSM and route summarization?（）

A、IGRP
B、EIGRP
C、RIP v1
D、RIP v2
E、OSPF
F、VTP
G、CDP

正确答案:B,D,E

第6题：

Which one of the WAN data－link protocols below is used for out－of－band signaling?()

A. HDLC

B. NCP

C. PAP

D. LAPD

E. LAPB

F. None of the above

参考答案：D

第7题：

Which one below has the proper word stress?_______

A．phoTographic
B．photoGraphic
C．photograPhic
D．Photographic

答案：B

解析：

考查单词的重音。以一ic结尾的英语词汇的重音往往落在倒数第二个音节上。例如：photographic，romantic，economic。

第8题：

Which of the protocols below, operates at Layer 2 of the OSI model, and is used to maintain a loop-free network?

A. RIP

B. STP

C. IGRP

D. CDP

E. VTP

F. None of the above

正确答案：B
B 解析：Explanation:
STP (spanning tree protocol) operates on layer 2 to prevent loops in switches and bridges.

Incorrect Answers:
A, C. RIP and IGRP are routing protocols, which are used at layer 3 to maintain a loop free routed environment.

D. CDP does indeed operate at layer 2, but it doest not provide for a loop free topology. CDP is used by Cisco devices to discover information about their neighbors.

E. VTP is the VLAN Trunking Protocol, used to pass VLAN information through switches. It relies on the STP mechanism to provide a loop free network.

第9题：

Which one of the WAN data-link protocols below is used for out-of-band signaling?（）

A、HDLC
B、NCP
C、PAP
D、LAPD
E、LAPB
F、None of the above

正确答案:D

第10题：

The statements below compare and contrast link state and distance vector routing protocols. Which of these are true?（）

A、Distance vector protocols send the entire routing table to directly connected neighbors.
B、Distance vector protocols are responsible for sending updates to all networks listed in the routing table.
C、Link state protocols are responsible for sending the entire routing table to the whole network.
D、Link state protocols send updates regarding their own links status to all other routers on the network.

正确答案:A,D

Which one of the protocols below

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