陈独秀说：“我们现在认定，只有这两位先生可以救治中国政治上、道德上、学术上、思想上一切的黑暗。”请

ise a default route into the Enterprise using EIGRP. The engineer creating the implementation plan has chosen to base this default route on the ip route command, rather than using i p default - network.Which of the following is not a useful step with this style of default route configuration?（）

A. Create the default route on R1 using the ip route 0.0.0.0 0.0.0.0 outgoinginterface command.

B. Redistribute the statically configured defa ult route.

C. Disable auto - summary.

D. Configure the network 0.0.0.0 command.

E. Ensure R1 has no manually configured summary routes using the ip summary- address eigrp command.

te command output on router R1 lists the following phrase: "Gateway of last resort is 1.1.1.1 to network 2.0.0.0".Whic h of the following is most likely to have caused this output to occur on R1?（）

A. R1 has been configured with an ip default- network 2.0.0.0 command.

B. R1 has been configured with an ip route 0.0.0.0 0.0.0.0 1.1.1.1 command.

C. R1 has been configured with an ip route 2.0.0.0 255.0.0.0 1.1.1.1 command.

D. Another router has been configured with an ip default - network 2.0.0.0 command.

E. Another router has been configured with an ip route 2.0.0.0 255.0.0.0 1.1.1.1 command.

A.TheswitchportattachedtoLinkBwillnottransistiontoup.

B.OneofthetwoswitchportsattachedtothehubwillgointoblockingmodewhenaBPDUisreceived.

C.Bothswitchportsattachedtothehubwilltransitiontotheblockingstate.

D.AheavytrafficloadcouldcauseBPDUtransmissionstobeblockedandleaveaswitchingloop.

E.TheswitchportattachedtoLinkAwillimmediatelytransitiontotheblockingstate.

erfaces, all assigned addresses in class A network 10.0.0.0. Router R3 has some working interfaces in class A net work 10.0.0.0, and others in class B network 172.16.0.0. The engineer experiments with the auto -summary command on R2 and R3, enabling and disabling the command in various combinations.Which of the following combinations will result in R1 seeing a rout e for 172.16.0.0/16, instead of the individual subnets of class B network 172.16.0.0?（）

A. auto - summary on R2 and no auto - summary on R3

B. auto - summary on R2 and auto - summary on R3

C. no auto -summary on R2 and no auto- summary on R3

D. no auto - summary on R2 and auto - summary on R3

es for subnets 10.1.1.0/24, 10.1.2.0/24, and 10.1.3.0/24, with EIGRP integer metrics of roughly 1 million, 2 million, a nd 3 million, respectively. An engineer then adds the ip summary - address eigrp 1 10.1.0.0 255.255.0.0 command to interface Fa0/0.Which of the following is true?（）

A. R1 loses and then reestablishes neighborships with all neighbors.

B. R1 no longer advert ises 10.1.1.0/24 to neighbors connected to Fa0/0.

C. 1 advertises a 10.1.0.0/16 route out Fa0/0, with metric of around 3 million (largest metric of component subnets).

D. R1 advertises a 10.1.0.0/16 route out Fa0/0,with metric of around 2 million (med ian metric of component subnets).

A.Allportswilltemporarilytransitiontothelearningstateforaperiodequaltothemaxagetimerplustheforwarddelayinterval.

B.Allportswilltransitiontemporarilytothelearningstateforaperiodequaltotheforwarddelayinterval.

C.ThedefaultagingtimeforMACaddressentrieswillbereducedforaperiodofthemaxagetimerplustheforwarddelayinterval.

D.ThedefaulthellotimeforconfigurationBDPUswillbereducedfortheperiodofthemaxagetimer.

A.TheportimmediatelytransitionstotheForwardingstate.

B.TheswitchgeneratesaTopologyChangeNotification（TCN）BPDU.

C.Theportimmediatelytransitionstotheerr-disablestate.

D.TheportbecomesanormalSTPswitchport.

our answers show the four different single -lin e prefix lists. The engineer then does a copy/paste of the configuration into a router.Which of the lists could match a subnet whose prefix length is 27?（）

A. ip prefix - list fred permit 10.0.0.0/24 ge 16 le 28

B. ip prefix - list barney permit 10.0.0.0/24 le 28

C. ip prefix - list wilma permit 10.0.0.0/24 ge 25

D. ip prefix - list betty permit 10.0.0.0/24 ge 28

onfiguration that follows shows the entire route map and related configuration. Which of the following is true regarding the filtering action on prefix 10.10.10.0/24 in this case?（）route - map question deny 10match ip address 1route - map question permit 20match ip address prefix- list fred!access - list 1 deny 10.10.10.0 0.0.0.255ip prefix - list fred permit 10.10.10.0/23 le 25

A. It will be filtered due to the deny action in route map clause 10

B. It will be allowed because of the double negative (two deny references) in clause 10

C. It will be permitted due to matching clause 20‘s reference to prefix - list freD

D. It will be filtered due to matching the implied deny all route map clause at the end of the route map