IP承载网中CE采用OSI的（）层工作方式（）

Given the host IP address of 192.168.100.60 and a network mask of 255.255.255.224 (or /27), which address represents the correct network address for the referenced host?（）

OR指令的作用是: 。( )

TCP functions at the Open System Interconnection(OSI)(61)layer, or Layer 4. Its chief responsibility is to ensure(62)end-to-end connectivity. IP, located one layer down, at the OSI network layer, or Layer 3, communicates the addresses of each(63)sender and receiver to the routers along the way. Routers and Layer 3 switches can read IP and other Layer 3(64). This information, combined with routing tables and other network intelligence, is all it takes to get(65)the room or around the world via TCP/IP.

在IP承载网局数据配置中，ISISHelloMD5认证密码是（）。

The Border Gateway Protocol(BGP)is an interautonomous system【S1】protoco1．The primary function of a BGP speaking system is to exchange network【S2】information withother BGP system．This network reachability information includes information on the list of Auton0．mous System(ASs)that reachability information traverses．BGP一4 provides a new set of mecha-nisms for supposing【S3】interdomain routing．These mechanisms include support for adver-tising an IP【S4】and eliminate the concept of network class within BGP．BGP-4 also intro-duces mechanisms that allow aggregation of routes，including【S5】of AS paths．These chan-ges provide support for the proposed supernettting schem【S1】

IP承载网AR配置IS-IS协议，设置overloadtime为（）s，缺省600s。

以下哪些情况会造成提示“Incorrect number or IP address”？（）

IP承载网负责接入业务的路由器叫（）

试说明运输层在协议栈中的地位和作用，运输层的通信和网络层的通信有什么重要区别？为什么运输层是必不可少的？

根据《中国移动IP承载网工程验收规范》，在对线缆的布放进行检查时，主要检查哪些线缆的布放（）。

在BGP/MPLSVPN中，采用VPN-IPV4地址来解决VPN站点间IP地址重叠的问题