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1. Question1 pointsWhich routing protocol is designed to use areas to scale large hierarchical networks?CorrectIncorrect
HintOSPF works best for a large hierarchical network, because OSPF supports a multiarea design, which provides a much better scaling capability compared with EIGRP
2. Question1 pointsWhich routing protocol uses link-state information to build a map of the topology for computing the best path to each destination network?CorrectIncorrect
HintOSPF is a link-state routing protocol and as such it uses a link-state database to construct a topology map of the network to calculate the best path to destination networks. RIP, RIPng, and EIGRP are distance vector routing protocols.
3. Question1 pointsAfter a network topology change occurs, which distance vector routing protocol can send an update message directly to a single neighboring router without unnecessarily notifying other routers?CorrectIncorrect
HintRIPv2 and EIGRP support updating neighboring routers via the use of multicasting. EIGRP is the only distance vector protocol that can support updating a specific neighbor by using unicast. OSPF and ISIS are link state protocols.
4. Question1 pointsWhich dynamic routing protocol was developed as an exterior gateway protocol to interconnect different Internet providers?CorrectIncorrect
HintBGP is a protocol developed to interconnect different levels of ISPs as well as ISPs and some of their larger private clients.
5. Question1 pointsA network administrator is researching routing protocols for implementation in a critical network infrastructure. Which protocol uses the DUAL algorithm to provide almost instantaneous convergence during a route failover?CorrectIncorrect
HintEIGRP is commonly the fastest IGP to converge because it maintains alternate routes. A switchover to an alternate route is immediate and does not involve interaction with other routers.
6. Question1 pointsWhich routing protocol sends a routing update to neighboring routers every 30 seconds?CorrectIncorrect
7. Question1 pointsWhich statement is an incorrect description of the OSPF protocol?CorrectIncorrect
HintLink-state protocols require more memory to create and maintain the link-state database.
8. Question1 pointsWhat happens when two link-state routers stop receiving hello packets from neighbors?CorrectIncorrect
HintHello packets serve a keepalive function to monitor the state of an adjacent router.
9. Question1 pointsWhat are two features of the OSPF routing protocol? (Choose two.)CorrectIncorrect
HintCharacteristics of OSPF include the following: Interior gateway protocol Link-state Classless Cost metric based on bandwidth Dijkstra algorithm Builds topological map Event-driven updates Hierarchical design Requires additional memory, CPU processing, and more initial bandwidth than other protocols
10. Question1 pointsWhat is maintained within an EIGRP topology table?CorrectIncorrect
HintThe EIGRP topology table maintains all the routes received from neighbors, not just the best paths. DUAL can use backup routes from the topology table to provide instantaneous route failover in the EIGRP routing table.
11. Question1 pointsWhat is the difference between interior and exterior routing protocols?CorrectIncorrect
HintInterior gateway protocols (IGPs) are used for routing within an organization having a common administration or autonomous system (AS). Exterior gateway protocols (EGPs) are used by service providers and sometimes by large companies.
12. Question1 pointsAn OSPF enabled router is processing learned routes to select best paths to reach a destination network. What is the OSPF algorithm evaluating as the metric?CorrectIncorrect
HintThe OSPF routing protocol uses the cumulative bandwidth as the metric for route computations.
13. Question1 pointsRefer to the exhibit. A network administrator has configured RIPv2 in the given topology. Which path would a packet take to get from the LAN that is connected to R1 to the LAN that is connected to R7?CorrectIncorrect
HintRIP utilizes hop count to calculate the best path from source to destination.
14. Question1 pointsWhich two components of an LSP enable an OSPF router to determine if the LSP that is received contains newer information than what is in the current OSPF router link-state database? (Choose two.)CorrectIncorrect
HintInformation such as sequence numbers and aging information is included in an LSP to help manage the flooding process. This information can assist a router in determining if it has already received the LSP from another router or if the LSP has newer information than what is already contained in the link-state database.
15. Question1 pointsWhat are two purposes of dynamic routing protocols? (Choose two.)CorrectIncorrect
HintThe purpose of dynamic routing protocols include the following: Discover remote networks Maintain up-to-date routing information Choose the best path to a destination network Find a new best path if the current path is not available
16. Question1 pointsWhat is the first step taken by a newly configured OSPF router in the process of reaching a state of convergence?CorrectIncorrect
HintBefore OSPF can form a neighbor adjacency and start the Hello protocol, it detects which interfaces are in an up and active state.
17. Question1 pointsRefer to the exhibit. OSPF is used in the network. Which path will be chosen by OSPF to send data packets from Net A to Net B?CorrectIncorrect
HintOSPF uses the shortest path first algorithm to select the best path to forward packets. Each path is labeled with a value for cost and this algorithm accumulates costs along each path, from source to destination. The path chosen from Net A to Net B is R1-R3-R5-R7, that is equal to 5+7+14+2=28, the shortest cost.
18. Question1 pointsIn the context of routing protocols, what is a definition for time to convergence?CorrectIncorrect
HintTime to convergence defines how quickly the routers in the network topology share routing information and reach a state of consistent knowledge.
19. Question1 pointsWhich two requirements are necessary before a router configured with a link-state routing protocol can build and send its link-state packets? (Choose two.)CorrectIncorrect
HintOnce a router has established its adjacencies, it can build its link-state packets (LSPs) that contain the link-state information, including the link cost. A router can only build a link-state after it has received link-state packets from adjacent routers. It then constructs its SPF tree from the least cost routes to remote networks which are used to populate its routing table.
20. Question1 pointsWhich two routing protocols are classified as distance vector routing protocols? (Choose two.)CorrectIncorrect
21. Question1 pointsWhich two events will trigger the sending of a link-state packet by a link-state routing protocol? (Choose two.)CorrectIncorrect
HintAn LSP (link-state packet) is only sent during initial startup of the routing protocol process on a router; and whenever there is a change in the topology, including a link going down or coming up, or a neighbor adjacency being established or broken. Data traffic congestion does not directly influence routing protocol behavior. LSPs are not flooded periodically, and update timers are not relevant to LSPs.
22. Question1 pointsWhich feature provides secure routing updates between RIPv2 neighbors?CorrectIncorrect
HintThe RIPv2 routing protocol supports routing protocol authentication to secure routing table updates between neighbors.
23. Question1 pointsWhich two protocols are link-state routing protocols? (Choose two.)CorrectIncorrect
HintOSPF and IS-IS are link-state protocols. EIGRP and RIP are distance vector protocols.
24. Question1 pointsWhat is a disadvantage of deploying OSPF in a large single area routing environment?CorrectIncorrect
HintLink-state protocols have the following disadvantages: Memory Requirements – Creating and maintaining the link-state database and SPF tree. Processing Requirements – The SPF algorithm requires more CPU time than distance vector algorithms because link-state protocols build a complete map of the topology. Bandwidth Requirements – Link-state packet flooding can adversely affect the available bandwidth on a network.
25. Question1 pointsMatch the features of link-state routing protocols to their advantages and disadvantages. (Not all options are used.)
- event-driven updates
- building a topological map
- fast convergence
- bandwidth consumption
- memory usage
- CPU processing time
- sending updates with broadcast
- using hop count of metric
- Advantage Target 1
- Advantage Target 2
- Advantage Target 3
- Disadvantage Target 1
- Disadvantage Target 2
- Disadvantage Target 3