ccnp最新题库
1.Based on this FIB table, which statement is correct?A. There is no default gateway.B. The IP address of the router on FastEthernet is 209.168.201.1.C. The gateway of last resort is 192.168.201.1.D. The router will listen for all multicast traffic.Answer: CExplanation:The 0.0.0.0/0 route is the default route and is listed as the first CEF entry. Here we see the next hop forthis default route lists 192.168.201.1 as the default router (gateway of last resort).2. A network administrator checks this adjacency table on a router. What is a possible cause for theincomplete marking?A. incomplete ARP informationB. incorrect ACLC. dynamic routing protocol failureD. serial link congestionAnswer: A3.A network engineer notices that transmission rates of senders of TCP traffic sharply increase anddecrease simultaneously during periods of congestion. Which condition causes this?A. global synchronizationB. tail dropC. random early detectionD. queue management algorithmAnswer:A4.Which three problems result from application mixing of UDP and TCP streams within a network with noQoS? (Choose three.)A. starvationB. jitterC. latencyD. windowingE. lower throughputAnswer:A,C,EExplanation:It is a general best practice not to mix TCP-based traffic with UDP-based traffic (especially streamingvideo) within a single service provider class due to the behaviors of these protocols during periods ofcongestion. Specifically, TCP transmitters will throttle-back flows when drops have been detected.Although some UDP applications have application-level windowing, flow control, and retransmissioncapabilities, most UDP transmitters are completely oblivious to drops and thus never lower transmissionrates due to dropping. When TCP flows are combined with UDP flows in a single service provider classand the class experiences congestion, then TCPflows will continually lower their rates, potentially givingup their bandwidth to drop-oblivious UDP flows. This effect is calledTCP-starvation/UDP-dominance.Thiscan increase latency and lower the overall throughput. TCP-starvation/UDP-dominance likely occurs if(TCP-based) mission-critical data is assigned to the same service provider class as (UDP-based)streaming video and the class experiences sustained congestion. Even if WRED is enabled on theservice provider class, the same behavior would be observed, as WRED (for the most part) only affectsTCP-based flows. Granted, it is not always possible to separate TCP-based flows from UDP-based flows,but it is beneficial to be aware of this behavior when making such application-mixing decisions.
6.Which statement about the use of tunneling to migrate to IPv6 is true?A. Tunneling is less secure than dual stack or translation.B. Tunneling is more difficult to configure than dual stack or translation.C. Tunneling does not enable users of the new protocol to communicate with users of the old protocolwithout dual-stack hosts.D. Tunneling destinations are manually determined by the IPv4 address in the low-order 32 bits ofIPv4-compatible IPv6 addresses.Answer:CExplanation:Using the tunneling option, organizations build an overlay network that tunnels one protocol over the otherby encapsulating IPv6 packets within IPv4 packets and IPv4 packets within IPv6 packets. The advantageof this approach is that the new protocol can work without disturbing the old protocol, thus providingconnectivity between users of the new protocol. Tunneling has two disadvantages, as discussed in RFC6144:Users of the new architecture cannot use the services of the underlying infrastructure.Tunneling does not enable users of the new protocol to communicate with users of the old protocolwithout dual-stack hosts, which negates interoperability.7.A network administrator executes the command clear ip route. Which two tables does this commandclear and rebuild? (Choose two.)A. IP routingB. FIBC. ARP cacheD. MAC address tableE. Cisco Express Forwarding tableF. topology tableAnswer:A,B
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