The ping loopback hangs with no output. Which of the following is the most likely cause？（）A、The loopback interface is down and resolv.conf is configured.B、The loopback is not in /etc/hosts and resolv.conf is configured.C、The loopback interface is down and

第1题：

第2题：

第3题：

下面关于loopback地址的说法，正确的是（）

• A、loopback又称管理地址，每个设备只有1个loopback地址；
• B、当设备的某个接口为down，则loopback也会相应的down；
• C、Loopback地址是逻辑地址，与物理接口的状态无关；
• D、以上都不对。

正确答案:C

第4题：

How is a loopback cleared on interface ge-0/0/0?（）

• A、Issue the operational command clear interfaces ge-0/0/0 loopback local.
• B、No command is necessary, the loopback times-out in 5 minutes.
• C、Issue the configuration command clear interfaces ge-0/0/0 loopback, then commit.
• D、Issue the configuration command delete interfaces ge-0/0/0 gigether-options loopback , then commit.

正确答案:D

第5题：

Which two steps are needed when configuring multiple RPs using MSDP within a single PIM domain? （）

• A、Configure a non-unique address on the loopback interface for use by the PIM RP.
• B、Configure MSDP with the unique address (router ID) as the local address of the peer.
• C、Configure MSDP with the non-unique address (router ID) as the local address of the peer.
• D、Configure a unique address on the loopback interface, used as the PIM RP.

正确答案:A,B

第6题：

The following configura tion exists on a router on one end of an IPv6 tunnel. Which type of tunnel is created by this configuration?（） interface loopback 1 ip address 1.1.1.1 255.255.255.255 interface tunnel 2 ipv6 address 2000::1::/64 tunnel source loopback 1 tunnel destina tion 2.2.2.2 tunnel mode ipv6ip ipv6 eigrp 1

• A、Automatic 6to4
• B、Manually configured tunnel
• C、ISATAP
• D、GRE

正确答案:B

第7题：

OSPF is enabled on router A. You execute the following command on router A and receive theaccompanying output:RouterA#ping 224.0.0.5 repeat1Type escape sequence to abort.Sending 1, 1 00 - byte ICMP Echos to 224.0.0.5, timeout is 2 seconds:Reply to request 0 from 10.100.100.1, 4 ms10.100.100.1 is the IP address of a loopback interface on router A. What can you conclude about router A?（）

• A、Only the router A loopback interface is parti cipating in the OSPF routing process
• B、None of the router A interfaces are participating in the OSPF routing process
• C、Router A is using the loopback interface IP address as its OSPF router ID
• D、Router A does not have any reachable OSPF neighbors

正确答案:D

第8题：

A user is browsing to a newly created internal site called www.comptia.org. After putting incredentials the page comes up blank. Which of the following is MOST likely the cause?（）

• A、The user must add the new site to the local log file.
• B、A proxy exception has not been configured.
• C、SMTP has not been configured.
• D、The loopback address has not been configured.

正确答案:B

第9题：

The ping loopback hangs with no output. Which of the following is the most likely cause？（）

• A、The loopback interface is down and resolv.conf is configured.
• B、The loopback is not in /etc/hosts and resolv.conf is configured.
• C、The loopback interface is down and resolv.conf is not configured.
• D、The loopback is not in /etc/hosts and resolv.conf is not configured.

正确答案:D

第10题：

Which set of commands correctly builds a PPP over Ethernet connection on a DSL connection?（）

• A、interface atm 5/1.1 atm pvc 1 0 101 aal5snap encapsulation ppp ppp authentication chap ip unnumbered loopback 1
• B、interface atm 5/1.1 atm pvc 1 0 101 aal5snap encapsulation pppoe interface pppoe 5/1.1 encapsulation ppp ppp authentication chap ip unnumbered loopback 1
• C、interface atm 5/1.1 atm pvc 1 0 101 aal5snap encapsulation pppoe interface atm 5/1.1.1 encap ppp ppp authentication chap ip unnumbered loopback 1
• D、interface atm 5/1.1 atm pvc 1 0 101 aal5snap encapsulation pppoe ppp authentication chap ip unnumbered loopback 1

正确答案:C

第11题：

第12题：

第13题：

第14题：

第15题：

Based on the following items， which two types of interfaces are found on all network-based IPS sensors？（）

• A、Loopback interface
• B、Command and control interface
• C、Monitoring interface
• D、Management interface

正确答案:B,C

第16题：

A system administrator did not receive a response while attempting to ping loopback. Which of the following would most likely resolve this problem？（）

• A、Issue startsrc -s loopback
• B、Issue startsrc -g tcpip
• C、Issue rc.tcpip
• D、Reconnect the network cable

正确答案:C

第17题：

Which of the following wiring standards would MOST likely be used to interconnect two devices without the use of a hub or switch?（）

• A、568A
• B、568B
• C、Crossover
• D、Loopback

正确答案:C

第18题：

This question is about the formation of OSPF adjacency. An OSPF adjacency will not form correctly across a point-to-point link in the same area. Which would most likely cause this problem？（）

• A、Each interface has a different OSPF cost.
• B、Each interface is configured with secondary addresses as well as primary addresses.
• C、Each interface has a different MTU size.
• D、Each interface is configured with theip unnumbered loopback 0 command.

正确答案:C

第19题：

Which of the following should a technician MOST likely use to test a RS-232 port?（）

• A、Loopback adapter
• B、Power supply tester
• C、The ping command
• D、Multimeter

正确答案:A

第20题：

In a cluster using /etc/hosts for name resolution， which of the following describes the minimum requirementsfor the /etc/hosts file？（）

• A、IP address and IP label of each service and boot interface in the cluster
• B、IP address and IP label of each service and boot interface in the cluster， loopback interface， and the hostname of the node
• C、IP address and IP label of each service and boot interface in the cluster， the loopbackinterface， and the cluster gateway
• D、IP address and IP label of each service and boot interface in the cluster， the loopbackinterface， the cluster gateway， and the subnet network addresses

正确答案:B

第21题：

When a local loopback is activated on a PPP serial link, what indicates that the local interface is good?（）

• A、A ping to the local address succeeds.
• B、A ping to the remote address succeeds.
• C、A ping to the remote address received a 'TTL expired' message.
• D、The interface shows a flag indicating that a loop is detected.

正确答案:D

第22题：

In a Bridged 1483 network, which set of commands is used to configure an ATM sub-interface?（）

• A、interface atm 6/0.33 atm pvc 33 0 33 aal5snap ip description Company-XYZ encapsulation bridge1483 ip address unnumbered loopback0
• B、interface atm 6/0.33 atm pvc 33 0 33 aal5snap ip description Company-XYZ encapsulation bridge1483 ip unnumbered loopback0
• C、interface atm 6/0.33 atm pvc 33 0 33 aal5snap encapsulation bridge1483 ip description Company-XYZ ip address unnumbered loopback0
• D、interface atm 6/0.33 atm pvc 33 0 33 aal5snap encapsulation bridge1483 ip description Company-XYZ ip unnumbered loopback0

正确答案:D

第23题：