三臺(tái)路由器，問：在路由器B（即中間的那臺(tái)路由器）上的E0/1的IN方向做一個(gè)ACL，要求路由器A可以TELNET路由器C，但是路由器C不可以TELNET路由器A。要求寫出ACL命令行。
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A.ping 192.168.1.255
B.ping with sweep option
C.ping 192.168.1.127
D.ping 192.168.1.64
E.ping with broadcast option
A.OSPF standard hellos
B.Cisco Discovery Protocol link detection
C.Bidirectional Forwarding Detection
D.Fast Link Pulse
E.autonegotiation
Refer to the exhibit. R2 and R3 are routers connected using Ethernet services from a service provider and can receive pings from each other. OSPF is configured as the routing protocol but adjacency is not happening. According to the output of the show commands in the exhibit, what could be the most likely cause of the problem?（）
A.Ethernet interfaces were configured as point-to-point.
B.Process IDs are not matching.
C.Configured bandwidths do not match on both interfaces.
D.Broadcasts and multicast are not being propagated over the Ethernet services.
E.OSPF cost does not match on both interfaces.
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Refer to the exhibit.How many broadcast domains exist in theexhibited topology？（）
four switches， which one will be root switch.（no pic）.
what is the advantage of policing opposite to shaping？
Refer to the exhibit.The network administrator is in acampus building distant from Building B.WANRouter is hosting a newly installed WAN link on interface S0/0.The new link is not functioning and the administrator needs to determine if the correct cable has been attached to the S0/0 interface.How can the administrator accurately verify the correct cable type on S0/0 in the most efficient manner?（）
The Frame Relay network in the diagram is not functioning properly.What is the cause of the problem?（）
QoS Mechanisms：?jiǎn)栐诓渴餛oS中要用的3個(gè)mechanisms是什么？
When upgrading the IOS image,the network administrator receives the exhibited error message.What could be the cause of this error?（）
How should arouter that is being used in a Frame Relay network be configured to avoid split horizon issues from preventing routing updates?（）
什么是NAT？
一堆交換機(jī)一個(gè)server、一個(gè)transpare，問配置prune在哪里配置？