单项选择题

A network administrator of a company has many branch locations each using a subnet mask of 255.255.255.224. Which of the following dynamic routing protocols should be used？（）

A.IPv6
B.RIP
C.IGRP
D.RIPv2

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单项选择题

A user is unable to connect to the network. A network technician is able to determine that there is a problem on the switch. All other users on that switch are able to connect successfully to the network. Which of the following is a probable cause？（）

A.Switching loop is occurring on the switch.
B.Wrong subnet mask on the switch.
C.Incorrect SNMP settings on the switch.
D.Port is misconfigured on the switch.

单项选择题

Which of the following protocols would a multilayer switch use to learn the IP address of a directly connected device？（）

A.ARP
B.BOOTP
C.Inverse-ARP
D.DNS

单项选择题

Which of the following is the default port for telnet？（）

A.20
B.21
C.22
D.23