Refer to the exhibit. What must be done on router RTA to ensure that EIGRP works effectively in a Frame Relay multipoint environment?（）

单项选择题Which statement is correct based upon the following output from the show command on RT1 ? （）

A. OSPFv3 establishes neighbor adjacencies by using global IPv6 addresses.
B. OSPFv3 establishes neighbor adjacencies by using Link - local addresses.
C. RT1 owns a subnet mask of 64 bits.
D. OSPFv3 establishes neighbor adjacencies by using IPv4 addr esses.

单项选择题The following exhibit show s ipv6 route output. What would the metric be for a summary route that summarizes all three OSPFv3 routes displayed?（）

A. 160
B. 140
C. 120
D. 100

单项选择题IS - IS creates and maintains adjacencies and neighbor relations by using the Hello protocol. For the following options, which are Hello packets used in IS - IS?（）

A. A generic Hello
B. Point - to - point Level 1, point - to -point Level 2, LAN Level 1, LAN Level 2
C. Point - to - point Level 1, point - to - point Level 2, LAN
D. Point - to - point, LAN Level 1, LAN Level 2

单项选择题When learning a new route, if a LSA received is not found in the topological database, what will an internal OSPF router do?（）

A. The sequence numbers are checked, and if the LSA is val id it is entered into the topology database.
B. The LSA is placed in the topological database and an acknowledgement is sent to the transmitting router.
C. The LSA is dropped and a message is sent to the transmitting router.
D. The LSA is flooded imme diately out of all the OSPF interfaces, except the interface from which the LSA was received.

单项选择题One of the most important characteristics of OSPF is Multiple areas. Which statement best describes why this feature is such an important enhancement to earlier routing protocols?（）

A. The network domain, when divided into areas, allows for the use of both IANA classful addressing and private addressing.
B. The use of multiple areas allows for the use of prioritization.
C. All computation is kept within the area, with minimum communication between the areas,allowing the network to scale to  larger sizes.
D. It is easier to implement security.