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Q1. Which two statements about the function of the stub feature in EIGRP are true? (Choose two.)
A. It stops the stub router from sending queries to peers.
B. It stops the hub router from sending queries to the stub router.
C. It stops the stub router from propagating dynamically learned EIGRP prefixes to the hub routers.
D. It stops the hub router from propagating dynamically learned EIGRP prefixes to the stub routers.
Answer: B,C
Explanation:
When using the EIGRP Stub Routing feature, you need to configure the distribution and remote routers to use EIGRP, and to configure only the remote router as a stub. Only specified routes are propagated from the remote (stub) router. The router responds to queries for summaries, connected routes, redistributed static routes, external routes, and internal routes with the message "inaccessible." A router that is configured as a stub will send a special peer information packet to all neighboring routers to report its status as a stub router. Without the stub feature, even after the routes that are sent from the distribution router to the remote router have been filtered or summarized, a problem might occur. If a route is lost somewhere in the corporate network, EIGRP could send a query to the distribution router, which in turn will send a query to the remote router even if routes are being summarized. If there is a problem communicating over the WAN link between the distribution router and the remote router, an EIGRP stuck in active (SIA) condition could occur and cause instability elsewhere in the network. The EIGRP Stub Routing feature allows a network administrator to prevent queries from being sent to the remote router.
Reference: http://www.cisco.com/c/en/us/td/docs/ios/12_0s/feature/guide/eigrpstb.html
Q2. Refer to the exhibit.
R3 prefers the path through R1 to reach host 10.1.1.1.
Which option describes the reason for this behavior?
A. The OSPF reference bandwidth is too small to account for the higher speed links through R2.
B. The default OSPF cost through R1 is less than the cost through R2.
C. The default OSPF cost through R1 is more than the cost through R2.
D. The link between R2 and R1 is congested.
Answer: A
Explanation:
The default formula to calculate OSPF bandwidth is BW = Bandwidth Reference / interface
bandwidth [bps] = 10^8 / / interface bandwidth [bps]
BW of the R1-R3 link = 10^8 / 100Mbps = 10^8 / 10^8 = 1
BW of the R2-R3 link = 10^8 / 1Gbps = 10^8 / 10^9 = 1 (round up)
Therefore OSPF considers the two above links have the same Bandwidth -> R3 will go to 10.1.1.1 via the R1-R3 link. The solution here is to increase the Bandwidth Reference to a higher value using the “auto-cost reference-bandwidth” command under OSPF router mode. For example: Router(config)#router ospf 1 Router(config-router)#auto-cost reference-bandwidth 10000 This will increase the reference bandwidth to 10000 Mbps which increases the BW of the R2-R3 link to 10^10 / 10^8 = 100.
Q3. How does EIGRP derive the metric for manual summary routes?
A. It uses the best composite metric of any component route in the topology table.
B. It uses the worst composite metric of any component route in the topology table.
C. It uses the best metric vectors of all component routes in the topology table.
D. It uses the worst metric vectors of all component routes in the topology table.
Answer: A
Explanation:
For example if your router has a routing table like this:
D 192.168.8.0/24 [90/2632528] via 192.168.0.1, 00:00:12, Serial0/0
D 192.168.9.0/24 [90/2323456] via 192.168.0.1, 00:00:12, Serial0/0
D 192.168.10.0/24 [90/2195456] via 192.168.0.1, 00:00:12, Serial0/0
D 192.168.11.0/24 [90/2323456] via 192.168.0.1, 00:00:12, Serial0/0
Now suppose you want to manually summarize all the routes above, you can use this command (on the router that advertised these routes to our router):
Router(config-if)#ip summary-address eigrp 1 192.168.8.0 255.255.248.0
After that the routing table of your router will look like this:
D 192.168.8.0/21 [90/2195456] via 192.168.0.1, 00:01:42, Serial0/0
And we can see the manual summary route takes the smallest metric of the specific routes.
Q4. Independent, multiple OSPF processes are entered on the same router, and the processes have the same destination route. Which OSPF process is used?
A. The route with the fewest hops is used.
B. Both processes are used to load balance the traffic.
C. The first route process that places a route into the routing table is used.
D. The route with the shortest prefix is used.
Answer: C
Q5. Refer to the exhibit.
Which statement about this GETVPN configuration is true?
A. Co-operative key servers are configured.
B. Redundant peers are configured.
C. The key server uses multicast mode to propagate rekey messages.
D. PSK authentication is configured.
Answer: A
Q6. Which three options must be configured when deploying OSPFv3 for authentication? (Choose three.)
A. security parameter index
B. crypto map
C. authentication method
D. IPsec peer
E. encryption algorithm
F. encryption key
G. IPsec transform-set
H. authentication key
Answer: A,C,H
Q7. Which is the way to enable the control word in an L2 VPN dynamic pseudowire connection on router R1?
A. R1(config)# pseudowire-class cw-enable
R1(config-pw-class)# encapsulation mpls
R1(config-pw-class)# set control-word
B. R1(config)# pseudowire-class cw-enable
R1(config-pw-class)# encapsulation mpls
R1(config-pw-class)# enable control-word
C. R1(config)# pseudowire-class cw-enable
R1(config-pw-class)# encapsulation mpls
R1(config-pw-class)# default control-word
D. R1(config)# pseudowire-class cw-enable
R1(config-pw-class)# encapsulation mpls
R1(config-pw-class)# control-word
Answer: D
Explanation:
The following example shows how to enable the control word in an AToM dynamic pseudowire connection:
Device(config)# pseudowire-class cw-enable
Device(config-pw-class)# encapsulation mpls
Device(config-pw-class)# control-word
Device(config-pw-class)# exit
Reference: http://www.cisco.com/c/en/us/td/docs/ios-xml/ios/mpls/command/mp-cr-book/mp-a1.html
Q8. You are tasked with configuring a router on an OSPF domain to import routes from an EIGRP domain and summarize the routes to 192.168.64.0.
Which statement configures the summarized route and provides equal-path route redundancy?
A. area 32 range 192.168.64.0 255.255.192.0 cost 100
B. area 32 range 192.168.64.0 255.255.63.0 cost 100
C. area 32 range 192.168.64.0 255.255.64.0 cost 100
D. area 32 range 192.168.64.0 255.255.192.0 multi-path
Answer: A
Explanation:
area range
To consolidate and summarize routes at an area boundary, use the area range command in router configuration mode. To disable this function, use the no form of this command.
Syntax Description
area-id
Identifier of the area about which routes are to be summarized. It can be specified as either a decimal value or as an IP address.
ip-address
IP address.
mask
IP address mask.
advertise
(Optional) Sets the address range status to advertise and generates a Type 3 summary link-state advertisement (LSA).
not-advertise
(Optional) Sets the address range status to DoNotAdvertise. The Type 3 summary LSA is suppressed, and the component networks remain hidden from other networks.
cost cost
(Optional) Metric or cost for this summary route, which is used during OSPF SPF calculation to determine the shortest paths to the destination. The value can be 0 to 16777215.
Reference: http://www.cisco.com/c/en/us/td/docs/ios/12_2/iproute/command/reference/fiprrp_r/1rfospf. html#wp1017596
Q9. DRAG DROP
Drag and drop the NAT operations on the left into the correct sequential order on the right.
Answer:
Q10. What are three required commands when you enable source-specific multicast for addresses in the range 233.0.0.0/8? (Choose three.)
A. ip multicast-routing
B. ip igmp version 3
C. ip pim ssm-range 233.0.0.0/8
D. ip igmp version 2
E. ip pim ssm-range default
F. set routing-options multicast ssm-groups 233.0.0.0/8
Answer: A,B,C
Q11. Which statement about the VLAN database is true?
A. Manually deleting the vlan.dat file can cause inconsistency in the database.
B. Private VLAN information is stored in the database.
C. VLAN configurations 1 through 4096 are stored in the vlan.dat file.
D. The VLAN database is used only if the VTP domain name in the VLAN database matches the VTP domain name in the startup-config file.
Answer: A
Q12. DRAG DROP
Drag and drop the EIGRP term on the left to the corresponding definition on the right.
Answer:
Q13. Refer to the exhibit.
Which two statements about the R1 configuration are true? (Choose two.)
A. The IP TTL value is copied to the MPLS field during label imposition.
B. The structure of the MLPS network is hidden in a traceroute.
C. The LDP session interval and hold times are configured for directly connected neighbors.
D. R1 protects the session for 86400 seconds.
E. All locally assigned labels are discarded.
Answer: B,D
Q14. A network engineer is extending a LAN segment between two geographically separated data centers. Which enhancement to a spanning-tree design prevents unnecessary traffic from crossing the extended LAN segment?
A. Modify the spanning-tree priorities to dictate the traffic flow.
B. Create a Layer 3 transit VLAN to segment the traffic between the sites.
C. Use VTP pruning on the trunk interfaces.
D. Configure manual trunk pruning between the two locations.
Answer: C
Q15. Which BGP feature prevents a router from installing an iBGP learned route in its routing table until the route is validated within the IGP?
A. confederation
B. aggregation
C. advertise-map
D. synchronization
Answer: B