思科认证推荐
1. which technology manages multicast traffic at layer 2 by configuring layer 2 lan interfaces dynamically to forward multicast traffic only to those interfaces that want to receive it?
a. igmp
b. igmp snooping
c. pim-dm
d. dvmrp
e. mospf
answer: b
2. which well-defined routing protocol would a network administrator configure on multicast routers when member routers are widely dispersed?
a. distance vector multicast routing protocol (dvmrp)
b. protocol independent multicast dense mode (pim-dm)
c. multicast open shortest path first (mospf)
d. protocol independent multicast sparse mode (pim-sm)
e. core-based trees (cbt)
answer: d
3. when building an ip multicast domain using pim which mode assumes that other routers do not want to forward multicast packets for the group?
a. pim-dm
b. pim-sm
c. pim-rp
d. cgmp
e. igmp snooping
answer: b
4. what is correct about the bgp synchronization command? (choose two.)
a. synchronization must be enabled when implementing a multi-homed bgp connection to multiple isps.
b. if it is turned on, a prefix learned from ibgp neighbor is valid only if a non-bgp (igp) route exists for that prefix.
c. synchronization is necessary when peering with an ebgp neighbor.
d. synchronization improves bgp routing convergence.
e. synchronization can be turned off if all the transit routers in an autonomous system running full mesh ibgp.
answer: be
5. all routers in the diagram are configured with eigrp. if rtb and rtc fail, which action will rta take with respect to the hq network?
a. rta will automatically route packets via rtd to the hq network.
b. rta will place the route via rtd into the hold down state.
c. rta will go into the active state for all routes.
d. rta will go into the active state for the route to hq network.
answer: d
6. which of the following nsap addresses is a private, locally administered address?
a. 39.0f01.0002.0000.0c00.1111.00
b. 48.0f01.0002.0000.0c00.1111.00
c. 49.0004.30ac.0000.3090.c7df.00
d. 52.0f01.0002.0000.0c00.1111.00
answer: c
7. router rta is configured as follows:
rta (config)#router rip
rta(config-router)#network 10.0.0.0
rta(config-router)#distribute-list 44 in interface bri0
rta(config-router)#exit
rta(config)#access-list 44 deny 172.16.1.0 0.0.0.255
rta(config)#access-list 44 permit any
what are the effects of this rip configuration on router rta? (choose two.)
a. no routing updates will be sent from router rta on interface bri0 to router rtx
b. router rta will not advertise the 10.0.0.0 network to router rtx
c. the route to network 172.16.1.0 will not be entered into the routing table on router rta
d. user traffic from the 172.16.1.0 network is denied by access-list 44
e. the routing table on router rta will be updated with the route to router rtw
answer: ce
8. a router is configured for redistribution to advertise eigrp routes into ospf on a boundary router. given the configuration:
router ospf 1
redistribute eigrp 1 metric 25 subnets
what is the function of the 25 parameter in the redistribute command?
a. it specifies the seed cost to be applied to the redistributed routes.
b. it specifies the administrative distance on the redistributed routes.
c. it specifies the metric limit of 25 subnets in each ospf route advertisement.
d. it specifies a new process-id to inject the eigrp routes into ospf.
answer: a
9. which two methods advertise internal networks to external isps via bgp? (choose two.)
a. using aggregate routes
b. disabling synchronization
c. forcing the next-hop address
d. defining routes via the network statement
answer: ad
10. place the bgp attributes in the correct order used for determining a route
