642-901 - BSCI - Building Scalable Cisco Internetworks
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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?
All computation is kept within the area, with minimum communication between the areas, allowing the network to scale to larger sizes.
Which BGP feature should be used to avoid high memory utilization on a router? Select the best response.
Given the following partial configuration for Router A: interface serial 0 ip address 10.1.1.1 255.255.255.0 encapsulation frame-relay ip ospf network point-to-multipoint router ospf 7 network 10.1.1.0 0.0.0.255 area 0 Which two statements are correct? (Choose two.) Select 2 response(s).
DR/BDR elections do not take place.
OSPF neighbor statements are not necessary.
Your network has a mixture of Fast Ethernet and Gigabit Ethernet links. What needs to be done to ensure optimal data routing when using OSPF? Select the best response.
Increase the reference-bandwidth used to calculate the interface default metrics, on all routers in your network.
How is network layer addressing accomplished in the OSI protocol suite? Select the best response.
Network Service Access Point address
You are troubleshooting an OSPF problem where external routes are not showing up in the OSPF database. Which two options are valid checks that should be performed first to verify proper OSPF operation? (Choose two.) Select 2 response(s).
Are the ASBRs trying to redistribute the external routes into a totally stubby area?
Is the subnets keyword being used with the redistribution command?
Which two methods use IPsec to provide secure connectivity from the branch office to the headquarters office? (Choose two.) Select 2 response(s).
Virtual Tunnel Interface (VTI)
Which one of the following statements about BGP is FALSE?
BGP uses notification and the update messages to establish and maintain the BGP neighbor relationship.
Which statement describes the difference between a manually configured IPv6 in IPv4 tunnel versus an automatic 6to4 tunnel?
An automatic 6to4 tunnel allows multiple IPv4 destinations.
Which EIGRP packet statement is true? Select the best response.
Update packets route reliable change information only to the affected routers.
Which command will display EIGRP packets sent and received, as well as statistics on hello packets, updates, queries, replies, and acknowledgments? Select the best response.
show ip eigrp traffic
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.
Network Address Translator-Protocol Translator (NAT-PT)
If a metric is not specified for routes that are redistributed into OSPF, the default metric that is assigned to the routes is 20, except for redistributed BGP routes. What is the metric that is assigned to redistributed BGP routes? Select the best response.
Which show command will display only the Type 5 LSAs in the OSPF topology database? Select the best response.
show ip ospf database external
What are two Cisco IOS commands that can be used to view neighbor adjacencies? (Choose two.) Select 2 response(s).
show ip ospf neighbors
show ip ospf interfaces
To make OSPF area 4 totally stubby, the following command was issued on the ABR in router configuration mode: area 4 stub. Which two things need to be done to finish making area 4 a totally stubby area? (Choose two.) Select 2 response(s).
Apply the area 4 stub command to all routers in the area.
On the ABR, use the area 4 stub command with the no-summary keyword.
For the accompanying router output, which of the following statements describes the state that neighbor 172.16.254.3 is in? Select the best response.
The router is listening on its server port for connection requests from the peer.
Which two routing protocols require a metric to be configured when redistributing routes from other protocols? (Choose two.) Select 2 response(s).
What is the purpose of configuring the router as a PPPoE client? Select the best response.
for DSL connectivity and removing the need for the end-user PC to run the PPPoE client software
You have implemented mutual route redistribution between OSPF and EIGRP on a border router. When checking the routing table on one of the OSPF routers within the OSPF routing domain, you are seeing some, but not all of the expected routes. Which two things should you verify to troubleshoot this problem? (Choose two.) Select 2 response(s).
The missing EIGRP routes are present in the routing table of the border router.
The subnet keyword on the border router in the redistribute EIGRP command.
What number is a valid representation for the 200F:0000:AB00:0000:0000:0000:0000/56 IPv6 prefix?
EIGRP has been configured to operate over Frame Relay multipoint connections. What should the bandwidth command be set to?
the CIR rate of the lowest speed connection multiplied by the number of circuits
Based on the need to limit processing and bandwidth utilization due to dynamic routing protocol operation, the following routing requirements have been specified for your network. - partial and incremental routing updates - only the devices affected by a topology change perform route recomputation - route recomputation only occurs for routes that were affected Which dynamic routing protocol should be deployed in your network to best meet these requirements? Select the best response.
In IPv6, the interfaces running OSPF can be configured with multiple address prefixes. Which statement is true about the IPv6 addresses that can be included into the OSPF process? Select the best response.
Specific addresses cannot be selected for importation into the OSPF process.
Which condition must be satisfied before an EIGRP neighbor can be considered a feasible successor? Select the best response.
The neighbor's advertised distance must be less than the feasible distance of the current successor.
Using the rules for IPv6 addressing, how can the address 2031:0000:240F:0000:0000:09C0:123A:121B be rewritten? Select the best response.
When an OSPF design is planned, which implementation can help a router not have memory resource issues? Select the best response.
Have a backbone area (area 0) with 40 routers and use default routes to reach external destinations.
Which statement is true about EBGP? Select the best response.
A static route can be used to form an adjacency between neighbors.
Which three are advantages to creating multiple areas in OSPF? (Choose three.) Select 3 response(s).
less frequent SPF calculations
smaller routing tables
reduced LSU overhead
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.
The missing OSPF routes are present in the routing table of the border router.
Which statement is true concerning 6to4 tunneling?
An edge router must use IPv6 address of 2002::/16 in its prefix.
Why should iBGP sessions be fully meshed within a Transit AS?
Routes learned via iBGP are never propagated to other iBGP peers.
A router has two paths to reach another network in a different autonomous system. Neither route was generated by the local router and both routes have the same default weight and local preference values. Which statement is true about how BGP would select the best path? Select the best response.
The router will prefer the shortest autonomous system path.
Which statement is true about the command ipv6 ospf 1 area 0? Select the best response.
It must be issued in interface configuration mode to enable the OSPF process for IPv6.
How is authentication handled with OSPFv3? Select the best response.
OSPFv3 for IPv6 authentication is supported by IPv6 IPsec.
Which three statements about OSPF areas are true? (Choose three.) Select 3 response(s).
Areas introduce a boundary on the link-state updates.
All routers within an area have the exact link-state database.
The calculation of the Dijkstra algorithm on a router is limited to changes within an area.
When troubleshooting an EIGRP connectivity problem, you notice that two connected EIGRP routers are not becoming EIGRP neighbors. A ping between the two routers was successful. What is the next thing that should be checked? Select the best response.
Verify that EIGRP is enabled for the appropriate networks on the local and neighboring router.
You have been tasked with setting up OSPF on an existing router usingIPv6. Which command enables OSPF for IPv6 on a router?
ipv6 router ospf process-id
When other routing protocol routes are being redistributed into OSPF, what is one of the most common problems? Select the best response.
missing the subnet option in the redistribute command.
Which statement is true about IBGP routers? Select the best response.
They do not need to be directly connected.
Which BGP attribute will not be advertised in routing updates to its neighboring routers? Select the best response.
Which statement about a non-zero value for the load metric (k2) for EIGRP is true? Select the best response.
EIGRP considers the load of an interface only when sending an update for some other reason.
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.
its MAC address
What is IPv6 router solicitation?
a request made by a node for the IP address of the local router
Which option is true regarding the synchronization rule?
Do not use or internally advertise a route until the route is learned from a source other than BGP.
Which two statements are true about IBGP neighbor relationships? (Choose two.) Select 2 response(s).
A full-mesh IBGP requires that neighbor relationships be established between all BGP enabled routers in the autonomous system.
The BGP split horizon rule specifies that routes learned via IBGP are never propagated to other IBGP peers.
Which BGP command provides the router ID, local preference, next hop, and BGP path in its output? Select the best response.
show ip bgp
Which DSL encapsulation method requires client software running on the end-user PC that is directly connected to a DSL modem? Select the best response.
When an EIGRP topology change is detected, what is the correct order of events when there is a FS? Select the best response.
DUAL is notified. The neighbor adjacency is deleted. Remove all topology entries learned from that neighbor. The feasible route is used.
After implementing EIGRP on your network, you issue the show ip eigrp traffic command on router C. The following output is shown: RouterC#show ip eigrp traffic IP-EIGRP Traffic Statistics for process 1 Hellos sent/received: 2112/2076 Updates sent/received: 47/38 Queries sent/received: 5/3 Replies sent/received: 3/4 Acks sent/received: 29/33 Input queue high water mark 2, 0 drops SIA-Queries sent/received: 0/0 SIA-Replies sent/received: 0/0 Moments later, you issue the same command a second time and the following output is shown: RouterC#show ip eigrp traffic IP-EIGRP Traffic Statistics for process 1 Hellos sent/received: 2139/2104 Updates sent/received: 50/39 Queries sent/received: 5/4 Replies sent/received: 4/4 Acks sent/received: 31/37 Input queue high water mark 2, 0 drops SIA-Queries sent/received: 0/0 SIA-Replies sent/received: 0/0 Moments later, you issue the same command a third time and the following output is shown: RouterC#show ip eigrp traffic IP-EIGRP Traffic Statistics for process 1 Hellos sent/received: 2162/2126 Updates sent/received: 53/42 Queries sent/received: 5/5 Replies sent/received: 5/4 Acks sent/received: 35/41 Input queue high water mark 2, 0 drops SIA-Queries sent/received: 0/0 SIA-Replies sent/received: 0/0 What information can you determine about this network? Select the best response.
There is a flapping link or interface, and router C knows an alternate path to the network.