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Module 2 Cisco 3 - OSPF What state are the routers in an OSPF network in after the DR and BDR are elected Perrine. J 1. Exstart 2. Full 3. Loading 4. Exchange 5/25/2017 Page 1 Module 2 Cisco 3 - OSPF What state are the routers in an OSPF network in after the DR and BDR are elected Perrine. J 1. Exstart 2. Full 3. Loading 4. Exchange 5/25/2017 Page 2 Module 2 Cisco 3 - OSPF Why would a network administrator choose to enable MD5 authentication for OSPF exchanges? (Choose three.) Perrine. J 1. to prevent OSPF packets from being decoded by unauthorized individuals using packet sniffers 2. to reduce OSPF information exchange overhead 3. to assure that OSPF routing information takes priority over RIP or IGRP updates 4. to encrypt routing tables to prevent unauthorized viewing 5. to ensure that routing information comes from a valid source 6. to prevent routing information from being falsified 5/25/2017 Page 3 Module 2 Cisco 3 - OSPF Why would a network administrator choose to enable MD5 authentication for OSPF exchanges? (Choose three.) Perrine. J 1. to prevent OSPF packets from being decoded by unauthorized individuals using packet sniffers 2. to reduce OSPF information exchange overhead 3. to assure that OSPF routing information takes priority over RIP or IGRP updates 4. to encrypt routing tables to prevent unauthorized viewing 5. to ensure that routing information comes from a valid source 6. to prevent routing information from being falsified 5/25/2017 Page 4 Module 2 Cisco 3 - OSPF What OSPF packet type establishes and maintains neighbor adjacencies? Perrine. J 1. Link-state request 2. Link-state acknowledgement 3. Hello 4. Database description packet 5/25/2017 Page 5 Module 2 Cisco 3 - OSPF What OSPF packet type establishes and maintains neighbor adjacencies? Perrine. J 1. Link-state request 2. Link-state acknowledgement 3. Hello 4. Database description packet 5/25/2017 Page 6 Module 2 Cisco 3 - OSPF Because of security concerns, a network administrator wants to set up authentication between two routers. Which of the following commands will configure Router_A to trust Router_B with a clear text password of apollo? Perrine. J 1. Router_A(config-if)# ospf authentication-key apollo 2. Router_A(config-if)# ip authentication-key apollo 3. Router_A(config-if)# ip ospf authentication apollo 4. Router_A(config-if)# ip ospf authentication-key apollo 5/25/2017 Page 7 Module 2 Cisco 3 - OSPF Because of security concerns, a network administrator wants to set up authentication between two routers. Which of the following commands will configure Router_A to trust Router_B with a clear text password of apollo? Perrine. J 1. Router_A(config-if)# ospf authentication-key apollo 2. Router_A(config-if)# ip authentication-key apollo 3. Router_A(config-if)# ip ospf authentication apollo 4. Router_A(config-if)# ip ospf authentication-key apollo 5/25/2017 Page 8 Module 2 Cisco 3 - OSPF What multicast address represents all OSPF routers? Perrine. J 1. 224.0.0.6 2. 224.0.0.1 3. 224.0.0.4 4. 224.0.0.5 5/25/2017 Page 9 Module 2 Cisco 3 - OSPF What multicast address represents all OSPF routers? Perrine. J 1. 224.0.0.6 2. 224.0.0.1 3. 224.0.0.4 4. 224.0.0.5 5/25/2017 Page 10 Module 2 Cisco 3 - OSPF In which types of networks are OSPF DR elections necessary? (Choose two.) Perrine. J 1. point-to-point 2. point-to-multipoint 3. broadcast multiaccess 4. nonbroadcast multiaccess 5/25/2017 Page 11 Module 2 Cisco 3 - OSPF In which types of networks are OSPF DR elections necessary? (Choose two.) Perrine. J 1. point-to-point 2. point-to-multipoint 3. broadcast multiaccess 4. nonbroadcast multiaccess 5/25/2017 Page 12 Module 2 Cisco 3 - OSPF What is a common feature of NBMA networks? Perrine. J 1. Support for only two routers 2. Support for more than two routers 3. No election of DRs 4. Full support for broadcast and multicast packets 5/25/2017 Page 13 Module 2 Cisco 3 - OSPF What is a common feature of NBMA networks? Perrine. J 1. Support for only two routers 2. Support for more than two routers 3. No election of DRs 4. Full support for broadcast and multicast packets 5/25/2017 Page 14 Module 2 Cisco 3 - OSPF What information can be obtained from the output of the show ip ospf interface command? (Choose three.) Perrine. J 1. link-state age intervals 2. timer intervals 3. router ID number 4. link-state update intervals 5. neighbor adjacencies 5/25/2017 Page 15 Module 2 Cisco 3 - OSPF What information can be obtained from the output of the show ip ospf interface command? (Choose three.) Perrine. J 1. link-state age intervals 2. timer intervals 3. router ID number 4. link-state update intervals 5. neighbor adjacencies 5/25/2017 Page 16 Module 2 Cisco 3 - OSPF What command allows OSPF routers to exchange routing updates without multicasts? Perrine. J 1. ip ospf neighbor 2. ospf neighbor 3. Neighbor 4. ip neighbor 5/25/2017 Page 17 Module 2 Cisco 3 - OSPF What command allows OSPF routers to exchange routing updates without multicasts? Perrine. J 1. ip ospf neighbor 2. ospf neighbor 3. Neighbor 4. ip neighbor 5/25/2017 Page 18 Module 2 Cisco 3 - OSPF Which router is the root of an SPF tree? Perrine. J 1. border router 2. nearest neighboring router 3. local router 4. trunk router, as determined by the SPF algorithm 5/25/2017 Page 19 Module 2 Cisco 3 - OSPF Which router is the root of an SPF tree? Perrine. J 1. border router 2. nearest neighboring router 3. local router 4. trunk router, as determined by the SPF algorithm 5/25/2017 Page 20 Module 2 Cisco 3 - OSPF .1 RTA 1.1.1.1 /32 Backbone or transit area switch 200.202.16.0/24 .2 .3 .4 RTB RTC RTD 2.2.2.2 /32 3.3.3.3 /32 4.4.4.4 /32 Assume each router’s running-configuration contains OSPF default configuration values and concurrently performs the two-way state process. Which router becomes the Backup Designated Router? Perrine. J 1. RTA 2. RTB 3. RTC 4. RTD 5/25/2017 Page 21 Module 2 Cisco 3 - OSPF .1 RTA 1.1.1.1 /32 Backbone or transit area switch 200.202.16.0/24 .2 .3 .4 RTB RTC RTD 2.2.2.2 /32 3.3.3.3 /32 4.4.4.4 /32 Assume each router’s running-configuration contains OSPF default configuration values and concurrently performs the two-way state process. Which router becomes the Backup Designated Router? Perrine. J 1. RTA 2. RTB 3. RTC 4. RTD 5/25/2017 Page 22 Module 2 Cisco 3 - OSPF Which of the following are disadvantages of link-state routing? (Choose three.) Perrine. J 1. Link-state protocols require careful network design. 2. Link-state protocols are prone to routing loops. 3. Link-state hello updates can cause broadcast flooding. 4. Link-state protocols place significant demands on router processors and memory resources. 5. Link-state protocols require a knowledgeable network administrator. 6. Link-state protocols do not support Variable Length Subnet Masking 5/25/2017 Page 23 Module 2 Cisco 3 - OSPF Which of the following are disadvantages of link-state routing? (Choose three.) Perrine. J 1. Link-state protocols require careful network design. 2. Link-state protocols are prone to routing loops. 3. Link-state hello updates can cause broadcast flooding. 4. Link-state protocols place significant demands on router processors and memory resources. 5. Link-state protocols require a knowledgeable network administrator. 6. Link-state protocols do not support Variable Length Subnet Masking 5/25/2017 Page 24 Module 2 Cisco 3 - OSPF Assuming that the network has converged, which of the following is true regarding the link-state database held by each router that is in the same OSPF area. ? 1. The link-state database is stored in a designated router and is accessed by each router in the area as needed. 2. Each router in an OSPF area has a link-state database containing the same status information. 3. Each router has a different link-state database depending on its location within the network. 4. The link-state database in each router only contains information about adjacent routers and the status of their links Perrine. J 5/25/2017 Page 25 Module 2 Cisco 3 - OSPF Assuming that the network has converged, which of the following is true regarding the link-state database held by each router that is in the same OSPF area. ? 1. The link-state database is stored in a designated router and is accessed by each router in the area as needed. 2. Each router in an OSPF area has a link-state database containing the same status information. 3. Each router has a different link-state database depending on its location within the network. 4. The link-state database in each router only contains information about adjacent routers and the status of their links Perrine. J 5/25/2017 Page 26 Module 2 Cisco 3 - OSPF A network administrator has configured a default route on Router_A but it is not being shared with adjacent Router_B and the other routers in the OSPF area. Which command will save the administrator the time and trouble of configuring this default route on Router_B and all of the other routers in the OSPF area? Perrine. J 1. Router_A(config-router)# ospf redistribute default-route 2. Router_B(config-router)# ospf redistribute default-route 3. Router_A(config-router)# default-information originate 4. Router_B(config-router)# default-information originate 5. Router_A(config-router)# ip ospf update-default 6. Router_B(config-router)# ip ospf update-default 5/25/2017 Page 27 Module 2 Cisco 3 - OSPF A network administrator has configured a default route on Router_A but it is not being shared with adjacent Router_B and the other routers in the OSPF area. Which command will save the administrator the time and trouble of configuring this default route on Router_B and all of the other routers in the OSPF area? Perrine. J 1. Router_A(config-router)# ospf redistribute default-route 2. Router_B(config-router)# ospf redistribute default-route 3. Router_A(config-router)# default-information originate 4. Router_B(config-router)# default-information originate 5. Router_A(config-router)# ip ospf update-default 6. Router_B(config-router)# ip ospf update-default 5/25/2017 Page 28