單項選擇題On which types of network will OSPF elect a backup designated router()。

A.point-to-point and multiaccess
B.point-to-multipoint and multiaccess
C.point-to-point and point-to-multipoint
D.nonbroadcast and broadcast multipoint
E.nonbroadcast and broadcast multiaccess


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1.單項選擇題Which type of attack is characterized by flood of packet that requesing a TCP connection to a server?()

A.denial of service
B.brute force
C.reconnaissance
D.Trojan horse

2.單項選擇題Which item represents the standard IPACL?()

A.access-list 50 deny 192.168.1.10.0.0.255
B.access-list 110 permit ip any any
C.access-list 2500 deny tcp any host 192.168.1.1 eq22
D.access-list 101 deny tcp any host 192.168.1.1

3.單項選擇題What is the default routing update period for RIPv2?()

A.15 seconds
B.30 seconds
C.180 seconds
D.240 seconds

4.多項選擇題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.Ituses 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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