CCNP-BSCN(1)
添加时间: 2007-9-6 0:35:51 作者: Cisco考试认证 阅读次数:85 来源: http://www.d9soft.com
CHEET SHEETS: BSCN (640-503)
COPYRIGHT KEEN INTERACTIVE 2000
Last Update: 8/7/00
1. Which of the following are true regarding route filtering?
a. It uses the same technique as packet filtering; it’s based on standard or extended access-lists
b. It is required when using EIGRP and OSPF at the same time
c. Unlike packet filtering (which uses inverted subnet masks, route filtering uses normal subnet masks
d. Route filtering is used only while performing route redistribution
2. Which of these are benefits of incorporating hierarchical addressing?
a. You can summarize multiple routes into single route summaries, making the network more scalable
b. A contiguous address assignment allows the most efficient use of address
c. Reduction in the number of routing table entries for participating routers
d. A more efficient allocation of addresses network-wide
e. A reduced number of routing table entries for participating routers
3. How can a single IP statement indicate many IP addresses?
a. Source-route bridge
b. Route summarization
c. Helper address
d. Default gateway
e. Passive interface
4. What essential reasons make OSPF better than RIP1?
a. OSPF can select paths based on bandwidth
b. Link-State protocols generally have faster convergence than Distance-Vector
c. OSPF supports VLSM
d. OSPF has no hop count limitation because it is based on path cost
e. OSPF can select paths based on bandwidth
5. Which of the following are true of EIGRP?
a. It only sends change-updates to the systems that are affected by the event
b. It can provide client address conflict resolution
c. It is considerably more complex than OSPF
d. It supports Variable Length Subnet Masking
e. It supports compression over the WAN link
6. What command will show the link-state database?
7. Which of the statements below correctly describes the GBP regular expression ‘^200_’?
a. Match only AS 200
b. Match all AS’s
c. Match strings received from AS 200
d. Match strings originating from AS 200
8. What is a BGP peer?
a. A BGP neighbor that the router has formed a TCP connection with
b. Another BGP router that the router is currently speaking with
c. Another BGO router that the router is unable to speak with
d. ABGP neighbor that the router has a broken TCP connection with
9. Which of the following are true of BGP?
a. IBGP is used between the AS
b. IBGP is used within the AS
c. EBGP is used between the AS
d. EBGP is used within the AS
10. What command will view all and only EIGRP-built routes?
11. An OSPF stubby or totally stubby Area can only exist if adjacent to which of the following?
a. LSA
b. LSP
c. BDR
d. ABR
e. DR
f. LSU
12. What command allows the operator to scroll through all currently TCP/IP routing protocols while displaying detailed information about them?
13. You stop sending RIP broadcasts from all router interfaces that do not require it. You notice that RIP is running on Ethernet0, Serial0, and Serial1 on the router in question. You find out that Serial0 does not need RIP. You want to shut down that protocol but only on that interface without using access-lists. How?
a. Configure RIP using the ‘passive interface’ command
b. Configure RIP using the ‘no router rip’ command
c. Configure Serial0 using the ‘shutdown rip’ command
d. Configure an outbound route filter on Serial0 for RIP
14. Why will an EIGRP route get stuck in the Active state?
a. The EIGRP router on the far end of the link has crashed
b. The reply to a query caused by a change in a route takes too long and times out
c. The physical link between the two AS’s has gone down
d. The network is unstable and probably has a routing loop
15. What is the most effective way to reduce large routing tables?
a. Route filters
b. CIDR summary blocks
c. Compression
d. Switching
16. What OSPF command allows you to connect together two Area 0 regions on your network?
17. You need to create an IP Routing Protocol Filter for EIGRP network 198.30.64.0/23. What mask should be used to create the routing protocol filter?
a. 0.0.1.255
b. 0.0.254.255
c. 255.255.1.0
d. 255.255.254.0
18. What command will turn off automatic classful boundary summarization for EIGRP routes?
19. Which of the following best describes a Type 3 or 4 LSA?
a. Summary link entry which shows in routing tables as ‘IA for OSPF inter-area
b. Autonomous System External type-1 which shows in routing tables as ‘E1’ for OSPF External-1
c. Network link entry that shows in routing tables as ‘0’ for OSPF
d. Router link entry/record which show in routing tables as ‘0’ for OSPF
20. How long will OSPF wait (after receiving no updates) before sending a summary-update?
a. 10 minutes
b. 20 minutes
c. 30 minutes
d. 1 hour
21. By default, how does BGP handle IGP routes?
a. BGP automatically redistributes all IGP routes
b. BGP advertisements are independent of IGP route propagation
c. GBP must wait until the IGP has propagated routing information across the autonomous system
d. BGP can immediately advertise routes without waiting until the IGP has propagated information across the autonomous system
22. What methods does EIGRP use to determine if a previous neighbor is dead?
a. Unicast
b. Hold Time
c. Multicast
d. Broadcast
23. What command should be used to double the default EIGRP/IGRP count?
24. Select the valid subnet number and broadcast address combinations for mask /26:
a. Subnet 10.0.0.128, broadcast 10.0.0.192
b. Subnet 10.0.0.64, broadcast 10.0.0.127
c. Subnet 10.0.0.128, broadcast 10.0.0.191
d. Subnet 10.0.0.0, broadcast 10.255.255.255
25. Policy-Based routing has which of these criteria?
a. Can Deny based on subnet mask
b. Can Deny based on RIP version
c. Can Match based on the IP address
d. Can Match based on Next Hop address
26. Which of the following BGP Path Attributes (metrics) is a proprietary enhancement?
a. Community
b. Origin
c. Aggregator
d. Weight
27. What command will create an EIGRP route summary for 192.231.0.0/16 in AS #3?
28. Which of the following are needed for an OSPF to form an adjacency?
a. Authentication Type and Password
b. Autonomous System Number
c. Area ID
d. Hello and Dead intervals
e. Stub Area Flag
29. You router has the following routes: 10.1.4.0/24, 10.1.5.0/24, 10.1.6.0/24, 10.1.7.0/24. You want to summarize these via BGP so that only the summary route is advertised. What command will accomplish this?
30. Which of the following correctly describes an OSPF Area Border Router?
a. It is used to connect various OSPF Areas
b. It is used only at the outside edge of an OSPF network for protocol translation
c. It is used only internally for OSPF to EIGRP redistribution
d. It is used for routing protocol redistribution
31. What will the command ‘debug ip ospf adj’ help to accomplish?
a. LSA type 1
b. Elections
c. LSA type 3 and 4
d. OSPF neighbor relationships
32. What OSPF command on the Area Border Router will summarize all routes going into area 9 with a 0.0.0.0 default route?
33. What command will make OSPF area 9 a Stub Area?
34. When BGP routers with the same AS number exchange information, this is known as ____?
a. BGP
b. EBGP
c. IGRP
d. IBGP
35. Which of the following are characteristics of the BGP routing protocol?
a. Link-state protocol
b. Interior gateway protocol
c. Exterior gateway protocol
d. Distance-Vector protocol
36. Which of the following is untrue of routers running internal BGP?
a. Routers are running IBGP when two BGP speaking routers are in different AS’s
b. They must form a TCP port 179 connection with each other
c. They do not have to be directly connected
d. Routers are running IBGP when two BGP speaking routers are in the same AS
37. Which of the following are true of a network design with a high number of OSPF routers in a single area?
a. Increased problems with routing table ‘black holes’
b. Increased SPF algorithm re-calculation times
c. Decreased OSPF update traffic overhead
d. Increased OSPF update traffic overhead
38. What is included in an OSPF DBD/DDP?
a. SPF entries from the OSPF routing table
b. STP entries from the OSPF spanning tree
c. LSA entries from the OSPF master router’s link-state database
d. Database Description Packets
39. What command would be most useful for determining if there is an access-list applied to an interface?
40. Which of these values is required by EIGRP as a Seed Metric when performing Route Redistribution?
a. Bandwidth, Delay, Reliability, Load, MTU
b. Cost, Delay, Reliability
c. Route-Tag
d. Cost
41. By default OSPF will not allow the network address ‘0.0.0.0’ to be generated into the routing table in normal Areas. The ‘ip classless’ command tells Distance Vector routing protocols like RIP and IGRP to ignore the Class A/B/C rules and allow the default route ‘0.0.0.0’ network entry to be propagated. What corresponding OSPF command on the ASBR for a normal area will accomplish the same goal?
42. Which of the following are true regarding an OSPF internal router?
a. Internal routers are in more than one area
b. At least one interface is in Area 0
c. All interfaces are in the same Area
d. Internal routers redistribute routing information with routers in other areas
43. What is the inverted wildcard mask of /26?
a. 63.255.255.255
b. 0.0.0.63
c. 192.255.255.255
d. 0.0.0.192
44. You attempt to start an OSPF process on your router and receive: ‘Unable to allocate router ID.’ What could be the problem?
a. The OSPF area is Stubby
b. No IP address assigned to any interface
c. Router ID is used by another router
d. All interfaces are shut down
45. Which route types are passed by an OSPF ABR into a Totally Stubby Area?
a. Generate Type 3-4
b. Generate Type 5
c. Generate 0.0.0.0
d. Generate Type 1-2
46. Which of the following are true of Route Reflectors?
a. The reduce the size of the BGP table
b. They enable the use of Route Summarization
c. They reduce the number of TCP sessions
d. They modify Split Horizon
47. Among these methods of sending an IGP route into BGP, which is not recommended?
a. Redistribute the IGP into BGP
b. Use the network command with the ‘mask’ option
c. Redistribute BGP into the IGP
d. Use the network command without the ‘mask’ option
48. Which of the following are reasons a network administrator would choose to run multiple routing protocols at the same time on the same network?
a. Reduce routing protocol overhead on the network
b. Optimize the route redistribution between areas
c. Convert from an older routing protocol to a more modern one
d. Acquisition of a company running a different routing protocol than your own
49. When would you not use BGP?
a. Routing policy and route selection are not important for your AS
b. A single connection to the Internet
c. When you need to perform load-sharing to multiple ISP’s simultaneously
d. Low bandwidth between your AS and the other AS
50. What are some advantages of tunneling IPX through IP?
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