Enterprise Router R1, in ASN 1, connects to ISP Router I1, ASN 2, using eBGP. The single serial link b etween the two routers uses IP addresses 10.1.1.1 and 10.1.1.2, respectively. Both routers use their S0/0 interfaces for this link. Which of the follow

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You administer a network that uses two routers， R1 and R2， configured as an HSRP group to  provide redundancy for the gateway. Router R1 is the active router and has been configured as  follows：   R1#configure terminal   R1（config）#interface fa0/0   R1（config-if）#ip address 10.10.0.5 255.255.255.0   R1（config-if）#standby 1 priority 150   R1（config-if）#standby preempt delay minimum 50   R1（config-if）#standby 1 track interface fa0/2 15   R1（config-if）#standby 1 ip 10.10.0.20   Which of the following describes the effect the standby preempt delay minimum 50 command will  have on router R1？（）

• A、 The HSRP priority for router R1 will increase to 200.
• B、 Router R1 will become the standby router if the priority drops below 50.
• C、 The HSRP priority for router R1 will decrease to 50 points when Fa0/2 goes down.  
• D、 Router R1 will wait 50 seconds before attempting to preempt the active router.

第4题：

Enterprise Router R1, in ASN 1, connects to ISP Router I1, ASN 2, using eBGP. There are two parallel serial links between the two rou ters. The implementation plan calls for each router to base their BGP TCP connection on their respective loopback1 interfaces, with IP addresses 1.1.1.1 and 2.2.2.2, respectively. Which of the following commands would not be part of a working eBGP confi guration on Router R1?（）

• A、router bgp 1
• B、neighbor 2.2.2.2 remote- as 2
• C、neighbor 2.2.2.2 update - source loopback1
• D、neighbor 2.2.2.2 multihop 2

第5题：

Router R1 sits at an Enterprise branch office, using both the Internet and a leased line to another Enterprise router for its two connectivity options back into the rest of the Enterprise network. The engineer planning for this branch decided to use the leased line for all Enterprise traffic, unless it fails, in which case the Internet connection should be used to pass traffic to the Enterprise. Which of the following is most likely to be useful on the branch router?（）

• A、IPsec tunnel
• B、GRE tunnel
• C、Floating stati c route
• D、An IGP

第6题：

Examine the following excerpt from the show ip eigrp topology 10.2.2.0/24 command on router R1.Which answer can be verified as definitely true based on this output?（） External data: Originating router is 10.1.1.1 AS number of route is 1 External protocol is OSPF, external metric is 64 Administrator tag is 0 (0x00000000)

• A、R1 is the router that redistributed the route
• B、R1's metric to reach subnet 10.2.2.0/24 is 64
• C、The route was redistributed on a router that has a router ospf 1 command configured
• D、R1 is redistributing a route to prefix 1 0.2.2.0/24 into OSPF

第7题：

The following output on Router R1 lists details of a BGP route for 190.1.0.0/16. Which of the following is true based on this output?（） R1# show ip bgp 190.1.0.0/16 BGP routing table entry for 190.1.0.0/16, version 121 Paths: (1 available, best #1, table Default - IP - Routing - Table) Advertised to update - groups: 1 1 2 3 4 1.1.1.1 from 2.2.2.2 (3.3.3.3) Origin IGP, metric 0, localpref 100, valid, internal, best

• A、R1 has a neighbor 1.1.1.1 command configured.
• B、R1 has a neighbor 2.2.2.2 command configured.
• C、The show ip bgp command lists a line for 190.1.0.0/16 with both a n > and an i on the left.
• D、R1 is in ASN 1.

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正确地为路由器命名为R1的命令是（）。

• A、hostname R1
• B、name R1
• C、router name R1
• D、name router R1

第15题：

In which Cisco IOS configuration mode is the route distinguisher （RD） configured？（）

• A、R1（config-route-at）#
• B、R1（config-route-map）#
• C、R1（config-it）#
• D、R1（config-vrf）#
• E、R1（config）#
• F、R1（router）#

第16题：

Router R1, a branch router, connects to the Internet using DSL. Some traffic flows through a GRE and IPsec tunnel, over the DSL connection, and into the core of an Enterprise network. The branch also allows local hosts to communicate directly with public sites in th e Internet over this same DSL connection. Which of the following answers defines how the branch NAT config avoids performing NAT for the Enterprise directed traffic but does perform NAT for the Internet - directed traffic?（）

• A、By not enabling NAT on the I Psec tunnel interface
• B、By not enabling NAT on the GRE tunnel interface
• C、By configuring the NAT - referenced ACL to not permit the Enterprise traffic
• D、By asking the ISP to perform NAT in the cloud

第17题：

Enterprise Router R1 connects an Enterprise to the Internet. R1 needs to create and advertise 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.

第18题：

An Enterprise rou ter, Ent1, displays the following excerpt from the show ip bgp command. ENT1 has an eBGP connection to an ISP router with address 3.3.3.3 and an iBGP connection to a router with address 4.4.4.4. Which of the following is most likely to be true?（） Network Next Hop Metric LocPrf Weight Path *> 3.3.3.3 0 0 1 1 1 1 2 18 i

• A、The Enterprise likely uses ASN 1.
• B、The neighboring ISP likely uses ASN 1.
• C、The route has been advertised through ASN 1 multiple times.
• D、Router Ent1 will add another ASN to the  AS_Path before advertising this route to its iBGP peer (4.4.4.4).

第19题：

Router R1 exists in an Enterprise that uses EIGRP as its routing protocol. The show ip route 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.

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