当学生A用两台R2624路由器在做路由器广域网口连通实验时误将本端路由器V.35线缆的插头插倒了。结果发现ping直连的路由器不通，请问此时查看本端路由器的状态应该是：（ ） A: Serial 0 is up, line protocol is up B: Serial 0 is up, line protocol is Down C: Serial 0 is Down, line protocol is Down D: Serial 0 is Down, line protocol is up

【单选题】在MSR 路由器上将链路封装从PPP 改为HDLC 的命令是 __ 。 A. line hdlc B. link-protocol hdlc C. encapsulation hdlc D. line-protocol hdlc

（）is the first line of protect between your computer and the public Internet. A: The Internet protocol B: The firewall C: The anti-virus software D: The intrusion-detection systems

Point to Point Protocol is a _______________. A: session layer Protocol B: transport layer Protocol C: data link layer Protocol

TCP/IP( Transmission Control Protocol/Internet Protocol)

Which type of IGP should you use to achieve scalability in a large enterprise network？（） A: link-state protocol B: path-vector protocol C: Bellman-Ford protocol D: distance-vector protocol

关于上面的display 信息描述正确的是（） [R1]display interface g0/0/0 GigabitEthernet0/0/0 current state:Administratively DOWN Line protocol current state:DOWN

[R1] display interface g0/0/0 GigabitEthernetO/O/O current state: Administratively DOWN Line protocol current state: DOWN 关于上面的display信息描述正确的是（）。

ARP指的是（ ） ‌ A: Address Resolution Protocol B: Address repeat Pattern C: Address Ring Protocol D: Adaptive Reset Protocol

(7-2)下面哪个是合法的URL格式?() A: protocol://resourceName/host:port/ B: protocol://port:host/resourceName C: protocol://host:port/resourceName D: protocol://resourceName:port/host