15 04 2014
Latest 2014 Pass4sure and Lead2pass Cisco 642-902 Practice Tests (51-60)
QUESTION 51
When an EIGRP topology change is detected, what is the correct order of events when there is a FS? Select the best response.
A. The neighbor adjacency is deleted.
The feasible route is used.
DUAL is notified.
Remove all topology entries learned from that neighbor.
B. DUAL is notified.
Remove all topology entries learned from that neighbor.
The neighbor adjacency is deleted.
Routes enter the Active state and the feasible route is used.
C. The neighbor adjacency is deleted.
Routes enter the Active state and the feasible route is used.
DUAL is notified.
Remove all topology entries learned from that neighbor.
D. DUAL is notified.
The neighbor adjacency is deleted.
Remove all topology entries learned from
that neighbor. The feasible route is used.
Answer: D
Explanation:
If a packet is not received before the expiration of the hold time, the neighbor adjacency is deleted, and all topology table entries learned from that neighbor are removed, as if the neighbor had sent an update stating that all the routes are unreachable. If the neighbor is a successor for any destination networks, those networks are removed from the routing table, and alternative paths, if available, are computed. This lets the routes quickly reconverge if an alternative feasible route is available.
QUESTION 52
Refer to the exhibit. Why is the 140.140.0.0 network not used as the gateway of last resort even though it is configured first? Select the best response.
R3#show run | include default-
ip default-network 140.140.0.0
ip default-network 130.130.0.0
R3#show ip route | begin Gateway
Gateway of last resort is 0.0.0.0 to network 130.130.0.0
116.0.0.0/8 is variably subnetted, 5 subnets, 3 masks
C 116.16.37.0/30 is directly connected, Serial1/0.2
C 116.16.32.0/30 is directly connected, Serial2/0.2
C 116.16.34.0/28 is directly connected, Serial1/0.1
C 116.16.35.0/28 is directly connected, Serial2/0.1
S 116.0.0.0/8 [1/0] via 116.16.34.0
* 140.140.0.0/32 is subnetted, 3 subnets
O 140.140.1.1 [110/65] via 116.16.34.4, 00:14:54, Serial1/0.1
O 140.140.3.1 [110/65] via 116.16.34.4, 00:14:54, Serial1/0.1
O 140.140.2.1 [110/65] via 116.16.34.4, 00:14:54, Serial1/0.1
* 130.130.0.0/16 is variably subnetted, 4 subnets, 2 masks
D* 130.130.0.0/16 is a summary, 00:30:04, Null0
C 130.130.1.0/24 is directly connected, Ethernet0/0
C 130.130.2.0/24 is directly connected, Ethernet0/1
C 130.130.3.0/24 is directly connected, Ethernet1/0
D 150.150.0.0/16 [90/679936] via 116.16.35.5, 00:02:58, Serial2/0.1
A. The last default-network statement will always be preferred.
B. A route to the 140.140.0.0 network does not exist in the routing table.
C. Default-network selection will always prefer the statement with the lowest IP address.
D. A router will load balance across multiple default-networks; repeatedly issuing the show ip route
command would show the gateway of last resort changing between the two networks.
Answer: B
Explanation:
As you can see in the exhibit, 140.140.0.0 doesn’t appear in the routing table.
QUESTION 53
Refer to the exhibit. Why are the EIGRP neighbors for this router not learning the routes redistributed from OSPF? Select the best response.
router eigrp 123 redistribute ospf 123
network 116.16.35.0 0.0.0.255 network 130.130.0.0
auto-summary
!
router ospf 123
log-adjacency-changes
network 116.16.34.0 0.0.0.255 area 0
neighbor 116.16.34.4
A. Redistribution must be enabled mutually (in both directions) to work correctly.
B. Auto-summary causes the OSPF routes redistributed into EIGRP to be summarized; thus the
OSPF network 116.16.34 is summarized to 116.34.0.0, which is already covered by the EIGRP
protocol.
C. Default metrics are not configured under EIGRP.
D. Both routing protocols must have unique autonomous system numbers for redistribution to function
correctly.
Answer: C
Explanation:
Same as RIP, when redistribute into EIGRP from OSPF, the default metric is infinite -> We must set a seed metric when redistributing into EIGRP.
QUESTION 54
Which BGP option is required when load sharing over multiple equal-bandwidth parallel links from a single CE router to a single ISP router over eBGP? Select the best response.
A. eBGP Multipath
B. eBGP Multihop
C. BGP Synchronization
D. Public AS numbers
Answer: B
QUESTION 55
Which BGP feature should be used to avoid high memory utilization on a router? Select the best response.
A. soft-reconfiguration
B. route refresh
C. BGP communities
D. full-mesh BGP peering
Answer: B
Explanation:
BGP routers have enormous routing tables so it uses much memory to proceed these routes. When a BGP policy is changed, the BGP session needs to be reset for the policy to take effect. But the resetting results in route churn and route flapping. There are two ways to clear a BGP session without resetting the TCP session between them (this is often called "soft reset"):
Soft-reconfiguration: stores all received (inbound) routing policy updates without modification in a table so that when a new filter is applied, the router will use this table to calculate the changes without resetting the TCP session between the two BGP peers . This is a memory-intensive (high memory utilization) method and is not recommended.
Route-refresh: allows a BGP router to request a remote peer resend its BGP Adj-RIB-Out. This allows the BGP router to reapply the inbound policy. The route-refresh capability requires no extra memory on the local router
QUESTION 56
Which functionality is required within an IP router that is situated at the boundary of an IPv4 network and an IPv6 network to allow communication between IPv6-only and IPv4-only nodes? Select the best response.
A. Autoconfiguration
B. Automatic 6to4 Tunnel
C. Automatic 6to4 Relay
D. Network Address Translator-Protocol Translator (NAT-PT)
E. Intrasite Automatic Tunnel Address Protocol (ISATAP)
Answer: D
Explanation:
http://www.cisco.com/en/US/prod/collateral/iosswrel/ps8802/ps6969/ps1835/prod_white_paper091 86a008011ff51.html (Introduction, see 4th para)
QUESTION 57
The administrator wants to verify the current state of the OSPF database loading process. Which show command should the administrator use? Select the best response.
A. show ip ospf [process-id] interface
B. show ip ospf neighbor
C. show ip ospf [process-id]
D. show ip ospf [process-id area-id] database
Answer: B
The "show ip ospf neighbor" command can be used to view the current state of the OSPF database loading process.
QUESTION 58
During the IPv6 autoconfiguration, what does the device append to the 64-bit prefix that it receives from the router to create its IPv6 address? Select the best response.
A. a pseudorandom generated number
B. its locally configured IPv4 address
C. the DHCP-supplied device ID
D. its MAC address
Answer: D
Explanation:
The automatic configuration is a great feature of IPv6. Imagine you have to manually configure an IPv6 address with 128-bit long, what a pain! With this feature, it is no longer necessary to configure each host manually. But notice that host only autonomously configures its own Link-local address (the IP address used on a LAN). The Link-local address can be created automatically using a link-local prefix of FE80::/10 and a 64-bit interface identifier (based on 48-bit MAC address).
For example, if your MAC address is 00:12:34:56:78:9a, your 64-bit interface identifier is 0012:34FF:FE56:789a (16-bit FFFE is inserted in the middle). And notice that the notation has been changed because IPv6 addresses require 16-bit pieces to be separated by ":". Then, according to the RFC 3513 we need to invert the Universal/Local bit ("U/L" bit) in the 6th position of the first octet (start counting from 0). The "u" bit is set to 1 to indicate Universal, and it is set to zero (0) to indicate local scope. In this case we set this bit to 1 because the MAC address is universally unique. Thus the result is: 0212:34FF:FE56:789a. Finally, add the link-local prefix FE80 to create the full IPv6 address:
FE80:0:0:0:0212:34FF:FE56:789a (or FE80::212:34FF:FE56:789a, in short form). Note: The reason for inverting the "U/L" bit is to allow ignoring it for short values in the manual configuration case. For example, you can manually assign the short address fc80::1 instead of the long fc80:0:0:0:0200::1.
QUESTION 59
Which two methods use IPsec to provide secure connectivity from the branch office to the headquarters office? (Choose two.)
A. DMVPN
B. MPLS VPN
C. Virtual Tunnel Interface (VTI)
D. SSL VPN
D. PPPoE
Answer: AC
Explanation:
http://www.ccnpguide.com/ccnp-route-642-902-vpns-and-ipsec/
QUESTION 60
You have implemented mutual route redistribution between OSPF and EIGRP on a border router. When checking the routing table on one of the EIGRP routers within the EIGRP routing domain, you are seeing some, but not all of the expected routes.
What should you verify to troubleshoot this problem? Select the best response.
A. The border router is using a proper seed metric for OSPF.
B. The border router is using a proper seed metric for EIGRP.
C. The administrative distance is set for OSPF and EIGRP.
D. The missing OSPF routes are present in the routing table of the border router.
E. The subnet keyword on the border router in the redistribute OSPF command.
Answer: D
Explanation:
We are checking the routing table on EIGRP routers not OSPF so we don’t need to check the seed metric for OSPF. Besides OSPF doesn’t need to specify seed metric as all external routes get a default metric of 20 (except for BGP, which is 1). We must specify seed metrics when redistributing into EIGRP (and RIP). If not all the redistributed routes will not be seen but the question says only some routes are missing. The default administrative distance for external routes redistributed into EIGRP is 170 so we don’t need to set it .
The sunbet keyword is only used when redistributing into OSPF, not to other routing protocols . We should check the routing table of the border router to see the missing OSPF routes are there or not. An incorrect distribute-list can block some routes and we can’t see it in other EIGRP routers.
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Latest 2014 Pass4sure and Lead2pass Cisco 642-902 Practice Tests (41-50) Latest 2014 Pass4sure and Lead2pass Cisco 642-902 Practice Tests (61-70)
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