单选题Which of the protocols below, operates at Layer 2 of the OSI model, and is used to maintain a loop-free network?（）A RIPB STPC IGRPD CDPE VTP

题目

单选题

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

RIP

STP

IGRP

CDP

VTP

参考答案和解析

正确答案： C

解析：暂无解析

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相似问题和答案

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：

The TCP/IP stack is a complete set of networking protocols. The OSI Model was meant

to be a standardized way of connecting devices together. and most protocols have some direct

correlation to the OSI Model. The OSI Model has 7 layers. the foruth layer is called(75)

A. physical layer

B. data link Iayer

C.application layer

D.transport layer

正确答案：D
TCP/IP协议栈是一种网络协议实现。OSI模型是用来进行设备间连接标准化的一种模型。OSI模型包含7层，第四层是传输层。

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：

The TCP/IP stack is a complete set of networking protocols.The OSI Model was meant to be a standardized way of connecting devices together,and most protocols have some direct correlation to the OSI Model.The OSI Model has 7 layers,the fourth layer is called______.

A.physical layer
B.data link layer
C.application layer
D.transport layer

答案：D

解析：

第5题：

Which protocols are found in the network layer of the OSI reference model and are responsible for path determination and traffic switching?()

A. LAN

B. routing

C. WAN

D. network

参考答案：B

第6题：

At which layer of the OSI model does error checking occur with IPv6?()

A. Layer 2

B. Layer 3

C. Layer 4

D. Layer 7

参考答案：C

第7题：

At which layer of the OSI model dose PPP perform?()

A. Layer 3

B. Layer 4

C. Layer 2

D. Layer 5

参考答案：C

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：

Acknowledgements, sequencing, and flow control are characteristics of which OSI layer()。

A.Layer2

B.Layer3

C.Layer4

D.Layer5

E.Layer6

F.Layer7

参考答案：C

第10题：

At which layer of the OSI model dose PPP perform?（）

A、Layer 3
B、Layer 4
C、Layer 2
D、Layer 5

正确答案:C

Which of the protocols below, operates at Layer 2 of the OSI

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