Exam Prep Questions

Question 1	Which one of the following EIGRP terms can best be described as a packet that is specifically transmitted by EIGRP peer routers when a neighbor is newly discovered and when changes occur? A. Hello packet B. Update packet C. ACK packet D. Successor packet
A1:	Answer B is correct. An update packet is sent reliably to communicate routes used for convergence purposes. It is sent when new neighbors are discovered and changes occur. Answer A is incorrect because a Hello packet is a multicast packet used for neighbor discovery. Answer C is incorrect because an ACK packet is a unicast packet used for acknowledging EIGRP queries, replies, and updates. Answer D is incorrect because it is not a packet type.
Question 2	Which of the following statements are true regarding the difference between IGRP and EIRGP? (Choose all that apply.) A. They both provide support for VLSM, classless routing, and discontiguous networks. B. They both use the same computations for determining the metric, except that EIGRP's metric is multiplied by 256. C. They both use distance-vector characteristics to find the optimal path to a network. D. They are both hybrid routing protocols using elements of distance-vector and link-state algorithms. E. They both utilize the DUAL to provide a loop-free environment and fast convergence.
A2:	Answers B and C are correct. IGRP and EIGRP both use the same metric computations with the exception of multiplying the result by 256 for scalability and granularity. Cisco improved its proprietary IGRP with EIGRP by delivering a hybrid protocol that uses elements of distance-vector and link-state characteristics. Answer A is incorrect because only EIGRP offers support for VLSM, classless routing, and discontiguous networks. Answer D is incorrect because only EIGRP is a hybrid routing protocol using elements of distance-vector and link-state algorithms. IGRP is a distance-vector protocol. Answer E is incorrect because only EIGRP uses the DUAL algorithm.
Question 3	A feasible successor is a backup route to the primary route. When is a route marked as a feasible successor? A. When the next hop router's FD value is lower than the advertised distance of the current successor route to the destination B. When the next hop router's FD value is higher than the advertised distance of the current successor route to the destination C. When the next hop router's advertised distance value is higher than the FD of the current successor route to the destination D. When the next hop router's advertised distance value is lower than the FD of the current successor route to the destination
A3:	Answer D is correct. A feasible successor is a neighboring router with a lower advertised distance. Answers A and B are incorrect because the next hop router's advertised distance, not feasible distance, is considered . Answer C is incorrect; the next hop router's advertised distance value must be lower and not higher to be a feasible successor.
Question 4	Which one of the following terms best describes the amount of time that a router waits for a Hello packet before downing a neighbor relationship? A. Holdtime B. Smooth round trip time C. Retransmission timeout D. Stuck in active
A4:	Answer A is correct. Holdtime is the time duration that a router waits for a Hello packet before ending a neighbor relationship. Answer B is incorrect because SRTT is the amount of time in milliseconds necessary to transmit a packet reliably to a neighbor and receive the subsequent ACK packet. Answer C is incorrect because RTO is the amount of time that an EIGRP router waits before retransmitting to a neighbor from the queue. Answer D is incorrect because SIA is actually a route that is abandoned and cleared when it takes too long for an EIGRP query to be answered .
Question 5	The default EIGRP holdtime is dependent on the Hello interval and defaults to which values for a LAN connection and slow WAN link, respectively? A. 5 seconds, 60 seconds B. 10 seconds, 90 seconds C. 15 seconds, 180 seconds D. 20 seconds, 240 seconds
A5:	Answer C is correct. The default EIGRP holdtime is 3 times the Hello interval of 5 seconds. This results in the default holdtime of 15 seconds for LAN and faster WAN interfaces and 180 seconds (3 minutes) on slow WAN links. Answers A, B, and D are incorrect because both of the multiples are wrong.
Question 6	Which of the following pieces of information are stored in the topology table? (Choose all that apply.) A. All the routes collected from neighboring routers B. The feasible distance to each destination network C. The administrative distance of EIGRP D. The active or passive status of the route
A6:	Answers A, B, and D are correct. The topology table contains all the routes that it has gathered from neighboring routers, including the FD to each destination network and the route status. Answer C is incorrect because the administrative distance value of EIGRP is displayed in the routing table.
Question 7	Which of the following statements are false concerning the EIGRP routing protocol? (Choose two.) A. EIGRP supports variable-length subnet masking. B. EIGRP Hello interval values cannot be modified. C. An EIGRP router can maintain up to nine separate tables. D. EIGRP auto-summarization cannot be disabled.
A7:	Answers B and D are correct. Both Answers B and D are false statements concerning the EIGRP routing protocol. You can indeed change the Hello interval value as well as disable auto-summarization in EIGRP. Answer A is incorrect because it is true that EIGRP supports VLSM. Answer C is also true. Because EIGRP can support the IP, IPX, and AppleTalk routed protocols, an EIGRP router can have up to nine separate tables: three neighbor tables, three topology tables, and three routing tables.
Question 8	If you wanted to specifically see all the IP entries in the topology table, which one of the following commands would you execute from the EXEC -mode prompt? A. Router#show ip protocols B. Router#show ip eigrp topology all-links C. Router#debug ip eigrp summary D. Router#show ip eigrp traffic
A8:	Answer B is correct. You can issue the show ip eigrp topology all-links command from the EXEC-mode prompt to display all the IP entries in the topology table. Answer A is incorrect because the show ip protocol command shows the settings for all IP routing protocols that are configured for use on a router. It also shows the current state of the EIGRP process, if applicable . Answer C is incorrect because the debug ip eigrp summary command, similar to the show ip protocols command, generates a summary version of your EIGRP operations. Answer D is incorrect because the show ip eigrp traffic command is used to establish the amount of control packet traffic that an EIGRP router has received and transmitted. This command displays the number of Hello, update, query, reply, and ACK packets that were sent to or received by a router.
Question 9	You are configuring a point-to-point frame relay connection to your service provider with six equal virtual circuits over a T1 connection. What should the configured bandwidth value be for each point-to-point subinterface? A. 56 B. 128 C. 256 D. 1544
A9:	Answer C is correct. If your subinterface has multiple VCs, you should configure the bandwidth value as the total CIR bandwidth divided by the number of VCs. In this case, the math would be 1.544Mbps ·6=256. Answers A, B, and D are incorrect because the math was wrong.
Question 10	You have configured an EIGRP hub router to use a single physical interface to connect three spoke routers with unequal CIR values. You multiplied the number of VCs by the lowest CIR value to calculate the interface bandwidth to prevent the circuit with the smaller CIR value from becoming overloaded. What is this topology known as? A. Pure multipoint topology B. DUAL topology C. Broadcast multiaccess topology D. Hybrid multipoint topology
A10:	Answer D is correct. This is an example of a hybrid multipoint topology in which unequal CIR values exist. You could also use subinterfaces and separate bandwidth value configurations to better manage the frame relay cloud. Answer A is incorrect because in a pure multipoint EIGRP WAN environment, one physical interface on the hub router is connected to two or more spoke routers that share identical CIRs for each circuit. Answer B is incorrect because there is no DUAL topology. The DUAL is the component that decides which information will be stored in the topology table. Answer C is incorrect because ethernet is a multiaccess broadcast topology where frame relay is a nonbroadcast medium.