A Ezonexam PC has the IP address 172.16.209.10 /22. What is the subnet of this address?

A．172.16.42.0

B．172.16.107.0

C．172.16.208.0

D．172.16.252.0

E．172.16.254.0

已知某台路由器的路由表中有如下两个表项假如该路由器要转发目的地址为9.1.4.5的报文，则下列说法中正确的是()

A.选择第一项，因为OSPF协议的优先级高

B.选择第二项，因为RIP协议的花费值(Metric)小

C.选择第二项，因为出口是Ethternet0，比Serial0速度快

D.选择第二项，因为该路由项对于目的地址9.1.4.5来说，是更精确的匹配

An administrator issues the show ip interface s0/0 command and the output displays that interface Serial0/0 is up, line protocol is up.

What does "line protocol is up" specifically indicate about the interface?

A．The cable is attached properly.

B．CDP has discovered the connected device.

C．Keepalives are being received on the interface.

D．A carrier detect signal has been received from the connected device.

E．IP is correctly configured on the interface.

Which OSI layer is associated with the following: The acknowledgement of transmissions, sequencing, and flow control across a network?

A. Layer 2

B. Layer 3

C. Layer 4

D. Layer 5

E. Layer 6

F. Layer 7

访问控制列表分为标准和扩展两种。下面关于ACL的描述中，错误的是()。

A.标准ACL可以根据分组中的IP源地址进行过滤

B.扩展ACL可以根据分组中的IP目标地址进行过滤

C.标准ACL可以根据分组中的IP目标地址进行过滤

D.扩展ACL可以根据不同的上层协议信息进行过滤

IP地址为：192.168.50.70，掩码为：255.255.255.248，则该IP地址所在子网的子网有效IP为（）

A.192.168.50.33---192.168.50.39

B.192.168.50.41---192.168.50.50

C.192.168.50.65---192.168.50.70

D.192.168.50.66---192.168.50.75

Why is full-duplex Ethernet superior to its single-duplex counterpart? (Select two answer choices.)

A．It uses inexpensive hubs

B．It operates without collisions

C．It operates on switches

D．It provides faster data transfer

E．It utilizes fewer wiring pairs

OSPF会运行算法以计算当前最佳路由。下列哪些术语会涉及到此算法()

A.SPF

B.DUAL

C.Feasible successor

D.Dijkstrae

E.Good old commonsense

“InsideGlobal”地址在NAT配置里表示的是什么()

A.这个概括地址是所有的内部子网地址

B.一个注册的地址是表示一个内部的主机到外部网络

C.一个全局唯一，私有的ip地址被分配给一个内网的主机

D.路由器的MAC地址被用做内部主机去连接这个互联网

Which of the following are types of flow control? (Choose three)

A．Buffering

B．Cut-through

C．Windowing

D．Congestion avoidance

E．Load balancing