【正文】 ted PPP/HDLC linksB. Frame RelayC. ISDNBRID. ADSLE. Broadband cable serviceAnswer: DExplanation:ADSL work by using a modem and is always on. The question tells you that the HQ router has no free ports, soby using a ADSL modem, it will be the best choice for this question. The cable modem would also be a goodchoice, but without much security, the ADSL is the better answer.Reference:CCNA SelfStudy CCNA INTRO exam certification Guide (Ciscopress, ISBN 1587200945) Page 465QUESTION NO: 26You work as a network technician at TestKing. You are configuring a E0 interface connected to theYou apply the following access list to the interface.640 801Leading the way in IT testing and certification tools, 22 accesslist 123 deny tcp eq 20 anyaccesslist 123 deny tcp eq 21 anyWhat consequence will this access list have?A. All traffic will be allowed to exit E0 except FTP traffic.B. FTP traffic from to any host will be denied.C. FTP traffic from to any host will be denied.D. All traffic exiting E0 will be denied.E. All FTP traffic to network Answer: DExplanation:By default access list is having implicit deny statement at the end. In this example there is no permit statement,so it will deny all traffic exiting E0 Interface.Incorrect answersA: It will deny FTP and Telnet TrafficB,C,E: It will deny all traffic in addition to the condition mentioned in the answer. Because there is no permitstatement at the end.QUESTION NO: 27Your TestKing trainee Charles is curios about characteristics of linkstate routing protocols.What should you tell him? (Choose three)A. Packets are routed based upon the shortest path to the destination.B. Paths are chosen based upon the cost factor to the destination.C. The exchange of advertisement is triggered by a change in the network.D. In a multipoint network, all routers exchange routing tables directly with all other routers.E. Every router in an OSPF area is capable of representing the entire network topology.F. Only the designated router in an OSPF area is capable of representing the entire network topology.Answer: A C EExplanation:Open Shortest Path First? Each router discovers its neighbors on each interface. The list of neighbors is kept in a neighbor table.? Each router uses a reliable protocol to exchange topology information with its neighbors.? Each router places the learned topology information into its topology database.? Each router runs the SPF algorithm against its own topology database.? Each router runs the SPF algorithm against its own topology database to calculate the best routes to eachsubnet in the database.640 801Leading the way in IT testing and certification tools, 23 ? Each router places the best rou233。 to each subnet into the IP routing table.The following list points out some of the key features of OSPF:? Converges very quickly – from the point of recognizing a failure, it often can converge in less than 10seconds.? Supports VLSM.? Uses short Hello messages on a short regular interval, with the absence of hello messages indicating thata neighbor is no longer reachable.? Sends partial updates when link status changes, and floods full updates every 30 minutes. The flooding,however, does not happened all at once, so the overhead s minimal.? Uses cost for the metric.Reference:CCNA SelfStudy CCNA INTRO exam certification Guide (Ciscopress, ISBN 1587200945) Page 417QUESTION NO: 28As a network technician at TestKing you are configuring access lists on an interface of a Cisco router.You use multiple access lists.Which of the following statements are valid? (Select one)A. There is no limit to the number of access lists that can be applied to an interface, as long as they areapplied in order from most specific to most general.B. Cisco IOS allows only one access list to be applied to an interface.C. One access list may be configured per direction for each Layer 3 protocol configured on an interface.D. Up to three access lists per protocol can be applied to a single interface.E. No more than two access lists can be applied to a single interface.F. The maximum number allowed varies depending on the amount of RAM installed in the router.Answer: EExplanation:Applying Access Lists to InterfacesFor some protocols, you can apply up to two access lists to an interface: one inbound access list and oneoutbound access list. With other protocols, you apply only one access list which checks both inbound andoutbound packets.If the access list is inbound, when the router receives a packet, the Cisco IOS software checks the access list39。scriteria statements for a match. If the packet is permitted, the software continues to process the packet. If thepacket is denied, the software discards the packet.If the access list is outbound, after receiving and routing a packet to the outbound interface, the software checksthe access list39。s criteria statements for a match. If the packet is permitted, the software transmits the packet. Ifthe packet is denied, the software discards the packet.640 801Leading the way in IT testing and certification tools, 24 Reference:12853QUESTION NO: 29You work as a network technician at TestKing. You are configuring a WAN link.Which are typical Layer 2 encapsulations for this link? (Choose three)A. EthernetB. Frame RelayC. POTSD. HDLCE. PPPF. Token RingAnswer: D E, ? (Pending. Send suggestion to feedback@.)Explanation:WAN datalink protocols used on pointtopoint serial links provide the basic function of data delivery acrossthat one link. The two most popular WAN datalink protocols are HighLevel Data Link Control (HDLC) andPPP.Reference:CCNA SelfStudy CCNA ICND exam certification Guide (Ciscopress, ISBN 158720083X) PageQUESTION NO: 30Roger is setting up WAN connectivity between t