三臺路由器，問：在路由器B（即中間的那臺路由器）上的E0/1的IN方向做一個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.Which statement describes DLCI 17?（）
QoS Mechanisms：問在部署QoS中要用的3個mechanisms是什么？
four switches， which one will be root switch.（no pic）.
what is the advantage of policing opposite to shaping？
A network administrator is troubleshooting the OSPF configuration of routers R1 and R2.The routers cannot establish an adjacency relationship on their common Ethernet link.The graphic shows the output of the show ip ospf interface e0 command for routers R1 and R2.Based on the information in the graphic,what is the cause of this problem?（）
Which of the following describes the roles of devices in a WAN?（）
The following configuration line was added to router R1 Access-list 101 permit ip 10.25.30.00.0.0.255 any What is the effect of this access list configuration?（）
兩ebgp鄰居發(fā)路由過來 ，哪些屬性重置？
What is the three main step of using the QoS feature with MQC command line interface？
The Frame Relay network in the diagram is not functioning properly.What is the cause of the problem?（）