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 th

第1题：

第2题：

What does the command clear ipv6 ospf process accomplish?（）

• A、The shortest path first (SPF) algorithm is performed on the LSA database.
• B、The OSPF adjacencies are cleared and initiated again.
• C、The OSPF database is repopulated. Then the shortest path first (SPF) algorithm is performed.
• D、The route table is cleared. Then the OSPF neighbors are reformed.

第3题：

The command "clear ipv6 ospf process" was issued on a router. What does this commandaccomplish？（）

• A、The route table is cleared. Then the OSPF neighbors are reformed
• B、The OSPF adjacencies are cleared and initiated again
• C、The OSPF database is repopulated and then the shortest path first （SPF） algorithm isperformed.
• D、The shortest path first （SPF） algorithm is performed on the LSA database
• E、None of the other alternatives apply

第4题：

During OSPF adjacency formation, in what state is a router when it is negotiating to be in charge of the database synchronization process?（）

• A、Init
• B、2Way
• C、ExStart
• D、Exchange

第5题：

A router has EIGRP configured as the only routing protocol. How does EIGRP respond if there is no feasible successor route to a destination network and the successor route fails?（）

• A、It immediately sends its entire routing table to its neighbors.
• B、EIGRP sends a Hello packet to the DR to inform it of the route failure.
• C、It automatically forwards traffic to a fallback default route until a successor route is found.
• D、It sends queries out to neighbors until a new successor route is found.
• E、It places the route in holddown until LSA updates inform it of a new route to the network.

第6题：

Router R1 sits inside OSPF area 1. Router R2 redistributes an E1 route into OSPF for prefix 2.2.2.0/24, with external metric 20. Router R22 redistributes an E2 route for the same prefix/length, external metric 10. Under what conditions will R1 choose as it s best route the route through R22?（）

• A、R1 will always choose the route through R22.
• B、As long as R1's best internal OSPF cost to reach R22 is less than 10.
• C、As long as R1's best internal OSPF cost to reach R22 is less than 20.
• D、R1 will never choo se the route through R22 if the E1 route through R2 is available.

第7题：

What type of OSPF router is responsible for redistributing routes into OSPF?（）

• A、ABR
• B、ASBR
• C、internal router
• D、backbone router

第8题：

第9题：

第10题：

第11题：

第12题：

第13题：

What will an Easy VPN hardware client require in order to insert its protected network address when it connects using network extension mode？（）

• A、 RADIUS or LDAP
• B、 an internal router running EIGRP
• C、 Reverse Route Injection and OSPF or RIPv2
• D、 the VPN appliance to be deployed in line with the firewall

第14题：

You have completed an OSPF implementation, and you are verifying OSPF operation. During this verification, you notice that the OSPF route of 172.16.10.0 is repeatedly appearing and disappearing from the routing table. Further investigation finds that the OSPF CPU utilization is very high and the routers are constantly performing SPF calculations. You determine that 172.16.20.2 is the source of the 172.16.10.0 route. Using the show ip ospf database router 172.16.20.1 command, you notice that when this show command is performed repeatedly, the contents of the LSA change every few seconds. What could be the cause of this problem?（）

• A、OSPF authentication errors between some of the routers
• B、Two routers have the same OSPF router ID
• C、Issues with mistuned OSPF timers
• D、OSPF LSA pacing issues between some of the routers
• E、OSPF neighbor adjacency problems between some of the routers

第15题：

The OSPF External LSA for prefix x.x.x.x exists in the OSPF database， but the prefix is not installed in therouting table. Which are possible explanations？（）

• A、Inbound distribute-list is configured under the ospf process and it is denying x.x.x.x
• B、ASBR origination the LSA is not reachable
• C、Route to the Forwarding Address in not an internal OSPF route
• D、Route to the Forwarding Address is an internal OSPF route
• E、Route to the ASBR does not follow the same path as the one to the Forwarding Address

第16题：

What kind of information does a router running a link-state routing protocol need to create and maintain its topological database?（）

• A、LSAs from other routers
• B、Beacons received on point-to-point links
• C、hello packets
• D、Routing tables received from neighbors
• E、SAP packets sent by other routers
• F、TTL packets from exclusive routers

第17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.

第18题：

What information does a router running a link-state protocol use to build and maintain its topological database？ （）

• A、 hello packets
• B、 SAP messages sent by other routers 
• C、 LSAs from other routers
• D、 beacons received on point-to-point links
• E、 routing tables received from other link-state routers
• F、 TTL packets from designated routers

第19题：

During OSPF adjacency formation， what state is a router in when it is sending LSA header information to its neighbor？  （）

• A、 Init
• B、 2Way
• C、 ExStart
• D、 Exchange

第20题：

第21题：

第22题：

第23题：

第24题：