單項(xiàng)選擇題You deployed new fibers in your network to replace copper spans that were too long. While reconnecting the network， you experienced network problems because you reconnected wrong fibers to wrong ports. What could you do to prevent this type of problem in the future， particularly when connecting and reconnecting fiber pairs？ （）

A. Only use fiber in pairs.
B. Configure root guard on your switches.
C. Do not use fiber but use copper.
D. Configure UDLD to prevent one-way link conditions.


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1.單項(xiàng)選擇題Which feature would prevent guest users from gaining network access by unplugging an IP phone andconnecting a laptop computer？（）

A.IPSec VPN
B.SSL VPN
C.port security
D.port security with statically configured MAC addresses
E.private VLANs

2.多項(xiàng)選擇題Refer to the exhibit. There are two sites connected across WAN links. All intersite and intrasite links always have the same routing metric. The network administrator sees only the top routers and links being used by hosts at both LAN A and LAN B. What would be two suggestions to load-balance the traffic across both WAN links？（）

A. Make HSRP track interfaces between the edge and core routers.
B. Replace HSRP with GLBP.  用GLBP替換HSRP
C. Add crossed intrasite links： R1-R4， R2-R3， R5-R8， and R6-R7.
D. Make R3 and R8 have lower HSRP priority than R1 and R7.
E. Replace HSRP with VRRP

4.單項(xiàng)選擇題Customer X has a hub-and-spoke Frame Relay network， with a central office and two branch offices （RemoteA and RemoteB）. Each location has only one physical link to the Frame Relay cloud and RemoteB has a router that is not a Cisco router. Since the installation， there is no connectivity between RemoteB and the central office. What is a possible solution to this issue？ （）

A. Because Frame Relay IETF encapsulation is only configurable at interface level， you must use IETF encapsulation on all routers.
B. This is not a possible scenario. A dedicated Frame Relay link to RemoteB is mandatory at the central office.
C. The router at RemoteB must be replaced by a Cisco router.
D. Use Frame Relay IETF encapsulation on a per-VC basis on the central office router.
E. There is a problem in the Frame Relay cloud， because Cisco routers are compatible with IETF Frame Relay.

5.單項(xiàng)選擇題For a router connected to two ISPs for redundancy， using IPSLA and static routing， how would youconfigure uRPF on the uplink interface？（）

A.ip verify unicast source reachable-via any
B.ip verify unicast reverse-path
C.ip verify unicast reverse-path loose
D.ip verify unicast reverse-path strict

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An expanding company is deploying leased lines between its main site and two remote sites. Thebandwidth of the leased lines is 128kb/s each，terminated on different serial interfaces on the main router.These links are used for combined VOIP and data traffic. The network administrator has implemented a VOIP solution to reduce costs，and has therefore reserved sufficient bandwidth in a low latency queue oneach interface for the VOIP traffic. Users now complain about bad voice quality although no drops areobserved in the low latency queue. What action will likely fix this problem？（）

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What is also called Type 0 authentication in OSPF on Cisco Routers？（）

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You are the network administrator of an enterprise with a main site and multiple remote sites. Your networkcarries both VOIP and data traffic. You agree with your service provider to classify VOIP and data trafficaccording to the different service RFCs. How can your data and VOIP traffic be marked？（）

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On the basis of the network provided in the exhibit， all routers are configured to run EIGRP on all links. If the link between PG-R1 and PG-R2 fails， what is the maximum number of queries PG-R3 will receive for 192.168.1.0/24， assuming that all the packets sent during convergence are transmitted once （there are no dropped or retransmitted packets）？（）

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Which types of prefixes will a router running BGP most likely advertise to an IBGP peer， assuming it is notconfigured as a route reflector？（）

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In GLBP，which router will answer on client ARP requests？（）

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Two routers configured to run BGP have been connected to a firewall， one on the inside interface and one on the outside interface. BGP has been configured so the two routers should peer， including the correctBGP session endpoint addresses and the correct BGP session hop-count limit EBGP multihop. What is agood first test to see if BGP will work across the firewall？（）

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What is true about Unicast RPF in strict mode？（）

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What is the command to configure RSVP to reserve up to one-tenth of a Gigabit link，but only allow eachindividual flow to use 1 MB/s？（）

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Which three message types are valid PIMv2 message types？（）

題型：多項(xiàng)選擇題