单选题When configuring a serial interface on a router, what is the default encapsulation?（）A atm-dxiB frame-relayC hdlcD lapbE ppp

第1题：

第2题：

第3题：

第4题：

When configuring a serial interface on a router, what is the default encapsulation?（）

• A、atm-dxi
• B、frame-relay
• C、hdlc
• D、lapb
• E、ppp

第5题：

When a router is connected to a Frame Relay WAN link using a serial DTE interface, how is the interface clock rate determined（）。

• A、It is supplied by the CSU/DSU.
• B、It is supplied by the far end router.
• C、It is determined by the clock rate command.
• D、It is supplied by the Layer 1 bit stream timing.

第6题：

A standard access control list has been configured on a router and applied to interface Serial 0 in anoutbound direction. No ACL is applied to Interface Serial 1 on the same router. What will happen whentraffic being filtered by the access list does not match the configured ACL statements for Serial 0？（）

• A、The traffic is dropped
• B、The resulting action is determined by the destination IP address
• C、The source IP address is checked，and，if a match is not found， traffic is routed out interface Serial 1
• D、The resulting action is determined by the destination IP address and port number

第7题：

A network planning diagram shows a large internetwork with many routers. The configurations show that OSPF has been enabled on all interfaces, I P addresses correctly configured, and OSPF workinG. For which of the following cases would you expect a router to create and flood a Type 2 LSA?（）

• A、When OSPF is enabled on a LAN interface, and the router is the only router connected to the subnet.
• B、  When OSPF is enabled on a point - to -point serial link, and that router has both the higher router ID and higher interface IP address on the link.
• C、When OSPF is enabled on a Frame Relay point - to - point subinterface, has the lower RID and lower subinterfa ce IP address, and otherwise uses default OSPF configuration on the interface.
• D、When OSPF is enabled on a working LAN interface on a router, and the router has been elected BDR.
• E、None of the other answers is correct.

第8题：

What is the reason for configuring a passive interface on a router?（）

• A、Allows interfaces to share common IP addresses.
• B、Allows an interface to remain up without the aid of keepalives.
• C、Allows a router to send routing and not receive updates via that interface.
• D、Allows a routing protocol to forward updates that is missing its IP address.
• E、Allows a router to receive routing updates on an interface but not send updates via that interface.

第9题：

When configuring PPP over ATM interfaces, what does the profile utility accomplish?（）

• A、It binds an interface to a virtual router.
• B、It allows for dynamic interface creation.
• C、It assigns a Domain Name Server for a session.
• D、It identifies the RADIUS server to use for authentication

第10题：

第11题：

第12题：

第13题：

第14题：

第15题：

You have just obtained a modular Cisco router with 2 serial connections and a BRI/U interface. What other physical piece of hardware is required in order to establish an ISDN connection?（）

• A、Nothing. The router is already suitable.
• B、A BRI WAN interface in the router.
• C、An external NT1 to terminate the local loop.
• D、A TA/NT1 device on the router.

第16题：

What is the purpose of this command? ip route 0.0.0.0 0.0.0.0 serial0/0（）

• A、It configures a router to send all packets out interface serial 0/0.
• B、It configures a router to block routing updates from being sent out interface serial 0/0.
• C、It configures a router as a firewall, blocking all unauthorized packets from exiting serial 0/0.
• D、It configures a router to send all packets for unknown destination networks out interface serial 0/0.
• E、It configures a router to drop all packets for which the destination network is unknown.

第17题：

While logged into a router you manually shut down the serial 0 interface using the "shutdown" interface configuration command. You then issue the "show interface serial 0" command in exec mode. What could you expect the status of the serial 0 interface to be?（）

• 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
• E、Serial 0 is administratively down, line protocol is down
• F、Serial 0 is administratively down, line protocol is up

第18题：

TestKing.com is configuring the serial interface of a Cisco router to connect to the router of a new ISP. A full T1 is being used for the Internet connection. After issuing the show interface serial 0/0 command, it is observed that the interface is UP and the line protocol is DOWN. Which of the following commands could fix this problem?（）

• A、Border# copy running-config startup-config
• B、Border(config)# no shutdown
• C、Border(config-if)# encapsulation ppp
• D、Border(config-if)# no cdp enable
• E、Border(config-if)# ip routing

第19题：

The Peanut router is able to successfully ping the Serial 0 and Ethernet 0 interface of the Popcorn router, but a ping issued to the Ethernet 1 interface fails. Based on the above output, what are the potential causes of this problem?（）

• A、The Popcorn router is not forwarding RIP updates.
• B、The Popcorn router did not include network 192.168.12.0 in its routing configuration.
• C、The Ethernet1 interface of the Popcorn router is shutdown.
• D、The clockrate is not present in the configuration of one of the routers.
• E、The Serial interface of the Popcorn router is not operating.

第20题：

What must be set correctly when configuring a serial interface so that higher-level protocols calculate the best route?（）

• A、bandwidth
• B、delay
• C、load
• D、reliability

第21题：

第22题：

第23题：