发信人: jiaxiang()
整理人: firphoenix(2001-10-28 22:28:03), 站内信件
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ACRC Questions and Answers
1. You intend to configure your ISDN router to be enabled for back-up
at 45%.
You also intend the back-up connection to remain up indefinitely. What
command will you enter?:
Ans.: Backup load 45 never
2. What is the default Administrative Distance for EIGRP (internal)?
Ans.: 90
3. What type of Link State Advertisement describes a set of routers at
tached to
a particular network and are flooded within the area that contain the
network?
a) Router Link
b) Network Link
c) Summary Link
d) Autonomous Link
Ans.: b) Network Link
4. Match the following LSA Types to their correct names:
a) Type 1 I) Summary Link
b) Type 2 ii) Autonomous System External
c) Type ?iii) Router Link
d) Type 5 iv) Network Link
Ans.: a) Type 1 iii) Router Link
b) Type 2 iv) Network Link
c) Type ?I) Summary Link
d) Type 5 ii) Autonomous System External
5. Enter the command to verify the IPX neighbours discovered by EIGRP?
Ans.: Show ipx eigrp neighbors
6. What command would prevent a router from establishing a neighbour
adjacency with a router connected to the same link as that specified i
n the
command?
Ans.: passive-interface
7. What command is required on all RIP/IGRP routes that must use a def
ault
route?
Ans.: ip classless
8. What does the value ?4?represent in the 揻air-queue 94?command?
a) Process-threshold
b) Congestive-threshold
c) Congestive-discard-threshold-number
d) Congestive-process-discard-threshold
Ans.: c) Congestive-discard-threshold-number
9. Which of the following IP addresses could be classed as a private a
ddress:
a) 172.16.8.0
b) 172.30.0.0
c) 172.15.30.0
d) 172.32.0.0
e) 172.160.0.0
Ans.: a) 172.16.8.0
b) 172.30.0.0
10. In which table is the feasible successor route kept?
a) Routing table
b) Neighbor table
c) Topology table
d) Successor table
e) Back-up table
Ans.: c) Topology table
11. You need to configure an alternative to Access-Lists for the addre
ss
193.145.34.16/0 that will save CPU cycles. What command would you ente
r?
Ans.: ip route 193.145.34.16 255.255.255.255 null 0
12. Name the two default criteria EIGRP uses for determining it抯 metr
ic.
a) Reliability
b) Bandwidth
c) Loading
d) Delay
e) MTU
Ans.: b) Bandwidth
d) Delay
13. List two ways IPX/SPX may be routed over a WAN connection.
Ans.: ipxwan
Tunnelling ipx
14. You wish to telnet into a Cisco 2501 from a device located on netw
ork
191.69.33.0 . The standard Access-List permitting traffic onto the Eth
ernet I/F
for this address has been created on the 2501. What two other commands
are needed to complete the process?
Ans.: line vty 0 4
Access-class 2 in
15. What command must be issued to all routers within an Area to defin
e the
Area as Stubby?
Ans.: Area area-id stub
16. What items are kept in the EIGRP Neighbor Table? Select four.
a) Queue
b) Destination address
c) Trigger time
d) Time trip (TT)
e) Smooth Round Trip Time (SRTT)
f) Neighbor address
g) Source address
h) Hold time
Ans.: a) Queue
e) Smooth Round Trip Time (SRTT)
f) Neighbor address
h) Hold time
17. Name two techniques, other than Access-lists or Passive-Interface,
to disable
routing updates across an ISDN link.
Ans.: Snapshot routing
Ipx spoofing
18. What command must you issue on the ABR to define the Area as Total
ly
Stubby?
Ans.: Area area-id stub no-summary
19. Link State routing can be used with Snapshot routing ?True or Fals
e?
Ans.: False
20. What command would you enter to spoof a periodic NetWare protocol
query
for inactive workstations?
Ans.: ipx watchdog-spoof
21. After receiving a multicast LSU packet, the Designated router floo
ds the LSU
across the network. What multicast address does it use?
a) 224.0.0.3
b) 224.0.0.1
c) 224.0.0.5
d) 224.0.0.9
e) 224.0.0.6
Ans.: c) 224.0.0.5
22. Name three features of Snapshot routing:
a) Irregular Routing updates
b) Hub and Spoke network
c) 換uiet Periods?
d) Link State routing
e) Meshed Network
f) Regular updates
Ans.: b) Hub and Spoke network
c) 換uiet Periods?
g) Regular updates
23. How does OSPF use the Dijkstra algorithm to select the best route?
a) Hop Counts
b) Calculate least bandwidth between location router and destination
router
c) Calculate least delay between location router and destination route
r
d) Adds up the total cost between location router and destination rout
er
e) Calculate the nearest adjacency between location router and
destination router
Ans.: d) Adds up the total cost between location router and destinatio
n router
24. What is the type of Bridging developed by IBM for use in Token Rin
g
Networks?
a) Encapsulated
b) SRB
c) IRB
d) Transparent
e) SRB Transparent
f) SRB Translational
Ans.: b) SRB
25. List three items that are incorrect with this command syntax-Prior
ity
list 18 protocol IP normalise TCP 23
Ans.: I) Missing ?(hyphen) between Priority & list
ii) List number must not be greater than 16
iii) Normalise should read normal
26. Name three principal components that make up OSPF Multi-areas?
Ans.: I) OSPF routers
ii) Areas
iii) LSA抯
27. What command would you issue to display the contents of the topolo
gical
database, which would provide the Router ID and Process ID?
Ans.: Show IP OSPF Database
28. This ISDN point references the connection between the NT1 and the
ISDN
network?
a) R
b) S
c) T
d) U
Ans.: d) U
29. I have a network address of 170.18.32.0/27. How many subnets and h
osts
will I be able to utilise?
Ans.: 2047 Subnets & 30 hosts
30. What is the routing protocol for AppleTalk and how frequent does i
t update?
Ans.: RTMP & 10 seconds
31. What type of BGP session occurs between routers in different AS, w
hich are
normally adjacent?
Ans.: External BGP (EBGP)
32. Calculate the route summarisation for a router table containing th
e following
addresses:-156.109.8.
0/22 156.109.16.0/22 156.109.20.0/22
156.109.24.0/22 156.109.28.0/22 156.109.32.0/22
Ans.: 156.109.8.0/21
156.109.16.0/20
156.109.32.0/19
33. What command would you use to configure the selected network 6d as
the
default network?
Ans.: ipx advertised-default-route-only 6d
34. What protocol carries BGP sessions?
a) IP
b) IPX
c) UDP
d) TCP
Ans.: d) TCP
35. What three elements are inherent in Dialer Profiles
a) Dialer map class
b) Dialer threshold
c) Dialer load
d) Dialer interface
e) Dialer snapshot
f) Dialer backup
g) Dialer pool
Ans.: a) Dialer map class
d) Dialer interface
g) Dialer pool
36. You wish to verify the 慼ello interval?and know neighbor adjacenci
es what
command would use?
Ans.: show ip ospf interface
37. Name three advantages which separating a large AS into smaller are
as would
bring?
Ans.: I) Reduced SPF calculations
ii) Smaller routing tables
iii) Reduced LSU overhead
38. After issuing the appropriate helper-address forwarding command yo
u now
wish to specify only a NetBios datagram [138] broadcast packet. What
command would you use?
Ans.: ip forward-protocol udp 138
39. Select four key parameters a router needs to route information:
a) Eigrp Database
b) Metric
c) Possible routes
d) Cost
e) Source address
f) MAC address
g) Destination address
h) Best paths
Ans.: c) Possible routes
e) Source address
g) Destination address
h) Best paths
40. What type of queuing method can you reserve a percentage of bandwi
dth
based on protocol and source interface?
Ans.: Custom queuing
41. Select three link state routing protocols
a) IP RIP
b) AppleTalk RTMP
c) IPX NLSP
d) IGRP
e) IP OSPF
f) IPX RIP
g) IS-IS
Ans.: c) IPX NLSP
e) IP OSPF
g) IS-IS
42. Where would you normally place your NAT routers?
a) Standard areas
b) Backbone areas
c) Stub areas
d) Totally stubby areas
Ans.: c) Stub areas
43. What ISDN protocol set deals with concepts and terminology?
a) E series
b) I series
c) Q series
Ans.: b) I series
44. Enter the correct sequence of events to describe how EIGRP discove
rs
routes utilising the various key phrases
a) Update packets
b) Hello packets
c) Primary & backup router selection
d) Initialisation process
e) Ack packet
f) Topology table update
Ans.: b) Hello packets
d) Initialisation process
e) Ack packet
f) Topology table update
a) Update packets
c) Primary & backup router selection
45. You want to instruct the router to issue SAP updates only when a c
hange
occurs. In an EIGRP network what command would you use?
Ans.: ipx sap-incremental eigrp
46. You intend to evaluate a Wide Area Network, what are four issues t
hat must
be considered:
a) Location
b) Routing protocol
c) Hardware type
d) Distance
e) Bandwidth
f) Ease of management
g) Cisco software 11.1 or greater
h) Cost
Ans.: b) Routing protocol
e) Bandwidth
f) Ease of management
h) Cost
47. This type of LSA is originated by ABR抯 and describes the links be
tween the
ABR and internal router of the local area;
a) Type 1
b) Type 2
c) Type ?
d) Type 5
Ans.: c) Type ?
48. How many hello packets must a router fail to receive to understand
that it抯
neighbor is unavailable:
a) 2
b) 3
c) 4
d) 5
e) 6
Ans.: b) 3
49. List two causes of network congestion
a) Network design issue
b) Inefficient routing protocol
c) Router memory
d) Bursty traffic
Ans.: a) Network design issue
d) Bursty traffic
50. You attempt to configure a network routing IPX RIP and a network r
outing
OSPF, but cannot complete the command why is that?
a) OSPF supports different metrics
b) OSPF does not support redistribution
c) OSPF does not support IPX/SPX stack
d) IPX/SPX does not support default routes
Ans.: c) OSPF does not support IPX/SPX stack
51. Your organisation operates over two sites; the remote site does no
t have
routing capabilities and utilises bridge segmentation. What method of
Bridging
will you use to connect the central routed site with the remote bridge
d site?
a) Transparent
b) Translational
c) SRB
d) IRB
e) SRB/ Transparent
f) SRB/Translational
Ans.: d) IRB
52. You are required to configure a secure link from a Cisco 1603 acro
ss an
ISDN line to a non-Cisco router. What type of encapsulation protocol w
ould
you choose/
a) SLIP
b) AARP
c) HCLC
d) SDLC
e) PPP
f) LAPB
Ans.: e) PPP
53. You have network 203.10.100.0 that you wish to hide. All other rou
tes are
being advertised out of the S1. What three commands should you issue t
o
stop this address from being advertised?
Ans.: a) Access-list 1 deny 203.10.100.0 0.0.0.255
b) Access-list 1 permit any
c) distribute-list 1 out s1
54. You are configuring Primary rate ISDN utilising an E1 link connect
ed to a pri-net5
switch. You now wish specify the slot frame type. What command will
you enter?
Ans.: framing crc4
55. What specific command would you use to ascertain protocol, frame t
ype, Mac
address and filters for a Bridging Virtual Interface 1 ?
Ans.: Show interface bvi 1
56. From the following config script find 3 different error that may c
ause
problems:
Bridge 64 protocol ieee
Bridge-group 64
Bridge 64 priority 65343
Bridge group 64 path-cost 25236
Ans.: a) Bridge group should be 1 ?63
b) Priority 0 to 64000 for ieee
c) - (hyphen) missing between bridge and group
57. After redistributing your routes between 2 AS configured for IGRP
and OSPF.
You observer a routing loop .After creating a standard access-list of
redistributed routes you now wish to amend the Administrative Distance
of
IGRP to resolve the routing loop. What command would you enter?
Ans.: distance 111 1
58. In what state do the DR and BDR establish adjacencies with each ro
uter in
the network?
a) Init state
b) Full state
c) Acknowledge state
d) Start state
e) LSA state
f) Exstart state
g) Loading state
Ans.: f) Exstart state
59. What new feature in Cisco 11.2 or later provided a mechanism to ai
d control
traffic volume for particular hosts/applications:
a) BECN
b) RED
c) GTS
d) RAD
Ans.: c) GTS
60. Name three key requirements for a scalable network.
a) Reachability
b) Efficiency
c) Manageable
d) Upgradeable
e) Adaptability
f) Responsiveness
g) Non-protocol specific
Ans.: b) Efficiency
e) Adaptability
f) Responsiveness
61. What command should I issue to observe the queuing status of all i
nterfaces
a) Show interfaces
b) Show queueing
c) Show custom-queue
d) Show queue all
e) Show queuing
Ans.: b) Show queueing
62. You are required to configure a legacy DDR link. What would be the
first and
minimal configuration to permit the line to be brought up and begin pa
cket
transmission?
Ans.: dialer-list 1 protocol ip permit
63. What command would you enter to determine whether routes were bein
g
added or dropped from the route table?
Ans.: Show ip eigrp events
64. You are required to configure CHAP authentication on your ISDN con
nection.
What command would you use together with two user defined variables?
Ans.: username user password pass
65. This field is located in the IEEE802.5 header to determine through
which
Token rings network segments a packet must transmit?
a) RFC
b) RHC
c) RDI
d) RIF
e) RFI
f) RBHC
Ans.: d) RIF
66. You need to bridge two token rings on separate networks, the local
ring is 502
and the target ring is 503, the Bridge number is 7. What command shoul
d you
enter to bridge these networks?
Ans.: source-bridge 502 5 503
67. What metric does NLSP use?
a) Cost
b) Bandwidth
c) Delay
d) Hop count
e) Load
Ans.: a) Cost
68. What range of access-lists can be used for AppleTalk?
a) 200 - 299
b) 300 ?399
c) 400 ?499
d) 500 ?599
e) 600 ?699
f) 700 ?799
Ans.: e) 600 ?699
69. What type of bridging method would enable source route stations to
communicate with transparent bridge stations with the help of an
independent bridge which provides translation for the two bridged prot
ocols?
a) Transparent
b) Translational
c) SRB
d) IRB
e) SRB/ Transparent
g) SRB/Translational
Ans.: g) SRB/Translational
70. You intend to create a default network for 194.105.157.0 . What co
mmand
would you issue?
a) Route(config) # IP default-network 194.105.157.0
b) Route(config-if) # IP default-network 194.105.157.0
c) Route# IP default-network 194.105.157.0
d) Route(config) # IP default network 194.105.157.0
Ans.: a) Route(config) # IP default-network 194.105.157.0
71. What command would you enter to define an area (# 3) as stubby?
a) Router(config)# area 3 stub no-summary
b) Router(config-router)# area 3 stub
c) Router(config-if)# area 3 stub
d) Router(config-router)# area 3 stub no-summary
Ans.: b) Router(config-router)# area 3 stub
72. Select three indications of a distance vector routing protocol.
a) Uses the Dijskstra algorithm
b) Sends updated routing tables to neighbors
c) Uses cost as the metric value
d) Utilises hop count up to 255
e) Uses Bellman-Ford algorithm
f) Establishes an Adjacencies routing table
g) Receives routing tables from routers of 2 hops or more away
h) Follows split horizon algorithm
Ans.: b) Sends updated routing tables to neighbors
e) Uses Bellman-Ford algorithm
h) Follows split horizon algorithm
73. I wish to modify the cost value assigned to an OSPF interface to a
value of
32656. How would I do this?
a) Router(config-if)# Ip ospf cost 32656
b) Router(config-if)# Ip-ospf cost 32656
c) Router(config-if)# Ip ospf-cost 32656
d) Router(config-router)# Ip ospf cost 32656
e) Router(config)# Ip ospf cost 32656
Ans.: a) Router(config-if)# Ip ospf cost 32656
74. You have devised a custom queue list #36. You now wish to link the
list with
an interface. What command would use
a) Custom queue list 36
b) Custom-queue list 36
c) Custom-queue-list 36
d) Custom queue-list 36
Ans.: c) Custom-queue-list 36
75. What command would you enter to establish the primary network numb
er c2a
that refers to your router while configuring NLSP connectivity?
Ans.: IPX internal-network c2a
76. I need to understand how many hello抯, updates, queries and acks I
have
received on my EIGRP network. What command can I use?
a) Show ip protocols
b) Show ip EIGRP topology
c) Show ip EIGRP neighbor
d) Show ip EIGRP traffic
e) Show ip EIGRP database
Ans.: d) Show ip EIGRP traffic
77. You wish to configure a loading threshold on your legacy DDR conne
ction.
This threshold will trigger another call to increase bandwidth. You re
quire this
call to be made at 100% load. What command will you use?
a) dialer load-threshold 255 either
b) dialer threshold-load 255 either
c) dialer load threshold 100 either
d) dialer threshold-load 100 either
e) dialer loading-threshold 255 either
Ans.: a) dialer load-threshold 255 either
78. I need information on the virtual links in my OSPF network. What c
ommand
shall I use ?
a) Show OSPF virtual-links
b) Show OSPF links
c) Show ip OSPF virtual
d) Show ip OSPF virtual-links
e) Show ip OSPF virtual links
f) Show OSPF virtual links
Ans.: d) Show ip OSPF virtual-links
79. BGP makes it抯 routing decisions based on network policy and not m
etrics?
True or false?
Ans.: True
80. How is ISDN basic rate commonly referred to as?
a) 2D+B
b) 2B D
c) 2 BD
d) 2B+D
Ans.: d) 2B+D
81. How would you configure that network 194.105.159.0 was part of the
EIGRP
AS?
a) Router(config-if) # Network ip eigrp 194.105.159.0
b) Router(config) # Network ip eigrp 194.105.159.0
c) Router(config-router) # Network ip eigrp 194.105.159.0
d) Router(config-router) # Network 194.105.159.0
Ans.: d) Router(config-router) # Network 194.105.159.0
82. What table includes route entries for all destinations that the ro
uter has
learned for each configured routing protocol?
a) Routing table
b) Topology table
c) Neighbor table
d) Successor table
e) Eigrp table
Ans.: c) Topology table
83. You need to display connected nodes on your NLSP router, as well a
s the
interface state. What command would you enter to view these?
Ans.: show ipx nlsp neighbor detail
84. When would you use BGP? Select one.
a) If you require quick and simple connection
b) Require a small routing table
c) Connect two ISP抯 or more
d) Establish an autonomous system
Ans.: c) Connect two ISP抯 or more
85. This point references the connection to the customer switching dev
ice or NT2.
a) R
b) S
c) U
d) T
Ans.: b) S
86. This packet switched Wan protocol can be used to encapsulate X25 a
nd
provides reliability and flow control on a point-to point line.
a) LAPD
b) LAPB
c) HDLC
d) SDLC
e) PPP
f) SLIP
Ans.: b) LAPB
87. You administer an IPX network, utilising EIGRP updates. You wish t
o reduce
SAP updates within AS 225. What command will you use?
a) Router(config-if)# Ipx sap interval eigrp 225
b) Router(config-if)# Ipx sap-incremental eigrp 225
c) Router(config)# Ipx sap-incremental eigrp 225
d) Router(config-router)# Ipx sap incremental eigrp 225
Ans.: b) Router(config-if)# Ipx sap-incremental eigrp 225
88. Select three criteria that would meet the definition of a Stub Are
a.
a) Accepts Type 5 LSA抯
b) Located in Area 0
c) Uses default route 0.0.0.0
d) Reduced routing table
e) A transit area for virtual links
f) Accepts type ?LSA抯
g) Has an ASBR attached
Ans.: c) Uses default route 0.0.0.0
d) Reduced routing table
f) Accepts type ?LSA抯
89. Which of the following guidelines for redistribution of network ro
utes would be
safe to heed?
a) If using ASBR and require 2-way redistribution, do not use default,
filters or changed metric, this will lead to 慴lack holes?
b) On your important network establish 2 way redistribution
c) On a single internetwork, do not run differing protocols
d) It is not essential to have in depth knowledge of your network
Ans.: c) On a single internetwork, do not run differing protocols
90. You are configuring your legacy DDR and wish to set the idle timeo
ut of the
line to 64 secs. Which command will you use?
a) Dialer idle timeout 64
b) Dialer timeout-idle 64
c) Dialer time idle 64
d) Dialer idle-timeout 64
Ans.: d) Dialer idle-timeout 64
91. On my eigrp network I need to view the active/passive states of my
routes, #
of successors and feasible distance. How can I do this?
Ans.: Show ip eigrp topology
92. On your ospf network, 194.105.158.0 255.255.255.224, you want to i
nstruct
the ABR to summarise routes for area 2. What command would do this?
a) Router(config)# area 2 range 194.105.158.0 255.255.255.224
b) Router(config-if)# area 2 range 194.105.158.0 255.255.255.224
c) Router(config-router)# area 2 range 194.105.158.0 255.255.255.224
d) Router(config-router)# area range 194.105.158.0 255.255.255.224 2
Ans.: c) Router(config-router)# area 2 range 194.105.158.0 255.255.255
.224
93. You are creating a dialer profile and now need to create the diale
r interface.
On this interface you need to input the following dialling information
: Number
to dial =761242; map class=crosshouses. What would be the correct
command to do this?
a) dialer class crosshouses number 761242
b) dialer pool 761242 class crosshouses
c) dialer-string 761242 class crosshouses
d) dialer profile 761242 class crosshouses
e) dialer-class crosshouses number 761242
Ans.: c) dialer-string 761242 class crosshouses
94. What would be the consequence of an incorrectly configured routing
redistribution? Select one.
a) Increased traffic
b) Protocol variance
c) Inconsistent convergence time
d) Corrupt routing tables
Ans.: c) Inconsistent convergence time
95. This wan connectivity protocol provides a connectionless packet se
rvice. It
can use fibre or copper. It supports speeds of 44.7 mbps on DS3 lines.
a) X25
b) ATM
c) SMDS
d) SONET
e) Frame 杛elay
Ans.: c) SMDS
96. Select three criteria that meet the definition of a Totally Stubby
area.
a) Attached to area 0
b) Smaller routing table than stubby area
c) Accepts type ?LSA
d) Default summary link 0.0.0.0
e) Used as transit area for virtual links
f) Accepts Type 5 LSA
g) Does not accept type ?LSA
Ans.: b) Smaller routing table than stubby area
d) Default summary link 0.0.0.0
g) Does not accept type ?LSA
97. You wish to verify how many times the dialer string has been reach
ed and
information about the idle timer. What command would you use?
a) Show ISDN status
b) Show ISDN active
c) Show dialer
d) Show ISDN stats
e) Show dialer status
Ans.: c) Show dialer
98. You wish to assign access-list 25 to filter incoming routing updat
es on E1
interface. What is the correct command?
a) Router(config)# distribute-list 25 in e1
b) Router(config-router)# distribute list 25 in e1
c) Router(config)# distribute list 25 in e1
d) Router(config-router)# distribute-list 25 in e1
Ans.: d) Router(config-router)# distribute-list 25 in e1
99. You wish to summarise a network in AS 8, for 195.104.157.0
255.255.255.224 .What command will you use?
a) Router(config)#ip summary-address eigrp 8 195.104.157.0
255.255.255.224
b) Router(config-if)#ip summary address eigrp 8 195.104.157.0
255.255.255.224
c) Router(config-if)#ip summary-address eigrp 8 195.104.157.0
255.255.255.224
d) Router(config)#ip summary address eigrp 8 195.104.157.0
255.255.255.224
Ans.: c) Router(config-if)#ip summary-address eigrp 8 195.104.157.0
255.255.255.224
100. You want to configure a default route for your IPX network #2110.
What
command to use?
a) Router(config)#ipx advertised-default route-only 2110
b) Router(config-if)#ipx advertised-default-route-only 2110
c) Router(config)#ipx advertised default route only 2110
d) Router(config)#ipx advertised-default-route-only 2110
Ans.: d) Router(config)#ipx advertised-default-route-only 2110
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