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The OSPF Hello protocol performs which of the following tasks? (Choose two.)（）
A . It provides dynamic neighbor discovery.
B . It detects unreachable neighbors in 90 second intervals.
C . It maintains neighbor relationships.
D . It negotiates correctness parameters between neighboring interfaces.
E . It uses timers to elect the router with the fastest links as the designated router.
F . It broadcasts hello packets throughout the internetwork to discover all routers that are running OSPF
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Which two are characteristics of the IS -IS protocol but not OSPF?（）
A . forms adjacencies with all neighbors
B . supports demand circuit routing
C . provides routing support for multiple network layer protocols
D . utilizes SPF algorithm
E . provides for network scalability by allowing the network to be separated into areas
F . three layers of hierarchical routing
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When BGP is used as the PE-CE routing protocol, which of these statements is correct?（）
A . On the CE router, PE neighbors must be configured in the VRF context on the CE router
B . On PE routers, the CE IBGP neighbors are configured in the global BGP configuration
C . On PE routers, the CE EBGP neighbors are configured in the VRF context
D . A separate BGP process must be used on the PE routers for CE routers so that they do not use the same BGP routing process as that used for the PE router's other provider neighbor
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A new network has been configured using OSPF as the routing protocol. With which network type will OSPF establish router adjacencies but not perform the DR/BDR election process?（）
A . point-to-point
B . Backbone area 0
C . Broadcast multicast
D . Non-broadcast multi-access
E . The DR/BDR process is done for all interface type
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What are some of the characteristics of the OSPF routing protocol?（）
A . It confines network instability to a single area of network.
B . It increases the routing overhead of the network
C . It supports VLSM
D . It routes between Autonomous Systems.
E . It allows extensive control of routing updates
F . None of the above
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Which two design recommendations are most appropriate when OSPF is the data center core routing protocol? （）
A . Never use passive interfaces.
B . Use NSSA areas from the core down.
C . Use totally stub areas to stop type 3 LSAs.
D . Use the lowest Ethernet interface IP address as the router ID.
E . Tune OSPF timers to enable OSPF to achieve quicker convergence.
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In the Carrier Supporting Carrier （CsC） feature， which two protocols run between CSC-PE and CSC-CE（）.
A . IGP and RSVP
B . EBGPv4 with a sending community
C . IGP and EBGPv4
D . IGP and LDP
E . EBGPv4 with a sending label
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The OSPF hello protocol performs which of the following tasks?（）
A . It provides dynamic neighbor discovery
B . It detects unreachable neighbors in 90 second intervals
C . It maintains neighbor relationships
D . It negotiates correctness parameters between neighboring interfaces
E . It uses timers to elect the router witch the fastest links as the designated router
F . It broadcasts hello packets throughout the internetwork to discover all routers that are running OSPF
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When the Cisco IOS OSPF command ip ospf dead-interval minimal hello-multiplier 5 is configured， which two statements are true？ （）
A . OSPF hello interval is 5 seconds
B . OSPF hello interval is 1 second
C . OSPF dead interval is 1 second
D . OSPF dead interval is 5 seconds
E . OSPF dead interval is 20 seconds
F . OSPF hello interval is 0.2 second
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Which two design recommendations are most appropriate when OSPF is the data center core routing protocol？ （）
A . Never use passive interfaces.
B . Use NSSA areas from the core down.
C . Use totally stub areas to stop type 3 LSAs.
D . Use the lowest Ethernet interface IP address as the router ID.
E . Tune OSPF timers to enable OSPF to achieve quicker convergence
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When a router undergoes the exchange protocol within OSPF, in what order does it pass through each state?（）
A . exstart state>exchange state>loading state>full state
B . exstart state>full state>loading state>exchange state
C . Loading state>exchange state>full state>exstart state
D . exstart state>loading state>exchange state>full state
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A router learns about a remote network from EIGRP, OSPF, and a static route. Assuming all routing protocols are using their default administrative distance, which route will the router use to forward data to the remote network（）。
A . The router will use the static route.
B . The router will use the OSPF route.
C . The router will use the EIGRP route.
D . The router will load balance and use all three routes.
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Refer to the exhibit. On the basis of the configuration provided, how are the Hello packets sent by R2 handled by R5 in OSPF area 5?（）https://assets.asklib.com/images/image2/2018073015415339700.jpg
A . The Hello packets will be exchanged and adjacency will be established between routers R2 and R5.
B . The Hello packets will be exchanged but the routers R2 and R5 will become neighbors only.
C . The Hello packets will be dropped and no adjacency will be established between routers R2 and R5.
D . The Hello packets will be dropped but the routers R 2 and R5 will become neighbors.
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When EIGRP is used as the PE-CE routing protocol which of these statements is correct?（）
A . EIGRP can be used only as the PE-CE routing protocol if the PE and CE routers are in the same AS
B . Other EIGRP AS routes are automatically advertised to the CE router and do not require a redistribution configuration command to be configured
C . Unlike other routing protocols that are used between PE and CE routers, EIGRP supports backdoor links
D . Configure of the VPN is only required on the PE router
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What are three characteristics of the OSPF routing protocol?（）
A . It converges quickly.
B . OSPF is a classful routing protocol.
C . It uses cost to determine the best route.
D . It uses the DUAL algorithm to determine the best route.
E . OSPF routers send the complete routing table to all directly attached routers.
F . OSPF routers discover neighbors before exchanging routing information.
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Which statements describe the routing protocol OSPF?（）
A . It supports VLSM.
B . It is used to route between autonomous systems.
C . It confines network instability to one area of the network.
D . It increases routing overhead on the network.
E . It allows extensive control of routing updates.
F . It is simpler to configure than RIP v2.
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In the Carrier Support Carrier （CsC） feature， which two protocols run CSC-PE and CSC-CS ？（）
A . EBGPv4 with a sending community
B . IGP and LDP
C . EBGPv4 with a sending label
D . IGP and EBGPv4
E . IGP and RSVP
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Which two are NOT characteristics of the OSPF routing protocol?（）
A . It confines network instability to a single area of network.
B . It increases the routing overhead of the network
C . It supports VLSM
D . It routes between Autonomous Systems.
E . It allows extensive control of routing update
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Which statements describe the routing protocol OSPF？（）
A . It supports VLSM.
B . It is used to route between autonomous systems.
C . It confines network instability to one area of the network.
D . It increases routing overhead on the network.
E . It allows extensive control of routing updates.
F . It is simpler to configure than RIP v2.
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A switch has been configured with two vlans and is connected to a router with a trunk for inter-vlan routing.OSPF has been configured on the router，as the routing protocol for the network.Which statement about thisnetwork is true？（）
A . For the two vlans to communicate，a network statement for the trunk interface needs to be added to the OSPF configuration.
B . For the two vlans to communicate， a network statement for each subinterface needs to be added to the OSPF configuration.
C . Direct inter-vlan communication does not require OSPF
D . OSPF cannot be used if router-on-a-stick is configured on the router
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Which of the following data structures exist on a router for the OSPF routing protocol？（）
A . OSPF topology table
B . OSPF interface table
C . OSPF routing information base
D . OSPF link-state database
E . OSPF adjacency table
F . OSPF neighbor table
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A router learns about a remote network from EIGRP, OSPF, and a static route. Assuming all routing protocols are using their default administrative distance, which route will the router use to forward data to the remote network?（）
A . The router will use the static route.
B . The router will use the OSPF route.
C . The router will use the EIGRP route.
D . The router will load balance and use all three routes.
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If the OSPF protocol is used to connect customer edge （CE） routers to service provider edge（PE） routers in the VPN backbone， which two options best describe the use of SHAM links？（）
A . A sham-link is created between any twoo VPN sites that belong to the same OSPF area and share an OSPF backdoor link
B . A sham-link is seen as an intra-area link between PE routers，an OSPF adjacency is created and data base is exchanged
C . A SHAM link is created between two directly connected PE routers so that it is preferred over the low speed backdoor door
D . A SHAM link is part of OSPF network of MPLS-VPN provider
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What is the OSPF default frequency,in seconds,at which a cisco router sends hello packets on a multi-access network?（）
A . 10
B . 40
C . 30
D . 20
