Mời trao đổi một số câu hỏi ôn tập CCNA

[VoThanhDuy]

RE: Một số câu hỏi ôn tập CCNA (phần III)

nếu không có frame-relay inverse-arp, bạn phải dùng lệnh frame-relay map để chỉ ra IP address và dlci mà bạn dự định dùng. Đáp án đúng là B.

[EIGRP]

68. You are working as a network technician at Contoso. You are required to troubleshooting the WAN link between the Contoso main office at Boston and the Contoso remote office at Rio De Janeiro. A Cisco router that was providing Frame Relay connectivity at the Rio de Janeiro site as replaced with a different vendor's frame relay router. Connectivity is now down between the Boston and Rio De Janeiro site.
What is the most likely cause of the problem?
A. Mismatched LMI types.
B. Incorrect DLCI.
C. Mismatched encapsulation types.
D. Incorrect IP address mapping.

Neu chung ta quay lai de bai:
A Cisco router that was providing Frame Relay connectivity at the Rio de Janeiro site as replaced with a different vendor's frame relay router.
Trong truong hop...if one router is not a Cisco router you must use IETF encapsulation(ICND - Cisco Press).
Boi vay, de cho Connectivity is now UP between the Boston and Rio De Janeiro site chung ta can config tren both Routers:

int serial 0
encapsulation frame-relay IETF

boi vay cho nen toi chon C -> Mismatched encapsulation types

52. Which command is required for connectivity in a Frame Relay network if Inverse ARP is not operational?
A. frame-relay arp
B. frame-relay map
C. frame-relay interface-dlci
D. frame-relay lmi-type

B -> frame-relay map

[cacodemon]

RE: Một số câu hỏi ôn tập CCNA (phần III)

cam on cac bac ban
cho minh hoi tiep ?

295.QUESTION NO: 295
Your ******** trainee wants to know which VLANs are allowed over a new trunk link that is configured
on an IOS based switch.
What will your reply be?

A. All defined VLANs are allowed on the trunk by default.
B. Each VLAN, or VLAN range, that is specified with the switchport mode command.
C. Each VLAN, or VLAN range, that is specified with the vtp domain command.
D. Each VLAN, or VLAN range, that is specified with the vlan database command.

288.QUESTION NO: 288
You are the CEO at ********. The network administrator has left the company unexpectedly. ********
is experiencing problems with its Internet connection. You retrieve the following interconnection
diagram from the equipment room.
Based on the diagram, what type of Internet connection could ******** have? (Choose two)

A. DSL
B. Frame Relay
C. ISDN
D. Dedicated T1
E. Wireless
F. POTS

253.QUESTION NO: 253
You are the network administrator at ********. The RIP routing protocol is being used on the ********
network. RIP is configured with default settings and equal cost load balancing. The ******** network
has six paths with the same metric and administrative distance for a single destination.
Which of the six paths will RIP use to reach the destination?

A. Only the first two paths that are learned.
B. Four of the paths.
C. All six routes in a routed robin fashion.
D. The oldest two paths in the routing table.
E. The first path learned to the destination network.

[dangquangminh]

Re: RE: Một số câu hỏi ôn tập CCNA (phần III)

cam on cac bac ban
cho minh hoi tiep ?

295.QUESTION NO: 295
Your ******** trainee wants to know which VLANs are allowed over a new trunk link that is configured
on an IOS based switch.
What will your reply be?

A. All defined VLANs are allowed on the trunk by default.
B. Each VLAN, or VLAN range, that is specified with the switchport mode command.
C. Each VLAN, or VLAN range, that is specified with the vtp domain command.
D. Each VLAN, or VLAN range, that is specified with the vlan database command.

.

Mặc định, kết nối trunk sẽ mang tất cả các VLAN.

[Hajime]

288.QUESTION NO: 288
You are the CEO at ********. The network administrator has left the company unexpectedly. ********
is experiencing problems with its Internet connection. You retrieve the following interconnection
diagram from the equipment room.
Based on the diagram, what type of Internet connection could ******** have? (Choose two)

A. DSL
B. Frame Relay
C. ISDN
D. Dedicated T1
E. Wireless
F. POTS

Where is diagram???

253.QUESTION NO: 253
You are the network administrator at ********. The RIP routing protocol is being used on the ********
network. RIP is configured with default settings and equal cost load balancing. The ******** network
has six paths with the same metric and administrative distance for a single destination.
Which of the six paths will RIP use to reach the destination?

A. Only the first two paths that are learned.
B. Four of the paths.
C. All six routes in a routed robin fashion.
D. The oldest two paths in the routing table.
E. The first path learned to the destination network.

Chọn B vì RIP có khả năng hỗ trợ 6 paths cho equal cost load balancing, nhưng default chỉ sử dụng 4 paths thôi

[Hajime]

Anh Minh wrote

51. A Class C network address has been subnetted with a /27 mask. Which of the following addresses is a broadcast address for one of the resulting subnets?

A. 201.57.78.33
B. 201.57.78.64
C. 201.57.78.97
D. 201.57.78.97
E. 201.57.78.159
F. 201.57.78.254

Không chọn được đáp án nào cả. Ta có Class C 201.57.78.0 / 27 nên ta có mỗi subnet có 32 IP address và 8 subnets.
Subnet 0: 201.57.78.0
Subnet 1: 201.57.78.32
Subnet 2: 201.57.78.64
…..
Subnet 7: 201.57.78.224

Broadcast address của subnet 0 là: 201.57.78.31, do đó muốn biết các địa chỉ ở trên cái nào là broadcast address thỉ ta chỉ việc trừ đi 31 và chia cho 32, nếu chia hết thỉ nó là địa chỉ broadcast.. -- không có địa chỉ nào phù hợp, =>đề sai

52. Which command is required for connectivity in a Frame Relay network if Inverse ARP is not operational?

A. frame-relay arp
B. frame-relay map
C. frame-relay interface-dlci
D. frame-relay lmi-type

Chọn câu B, frame-relay map ip vì Frame Relay sử dụng LMI và Inverse ARP để map IP và DLCI, nếu không có Inverse ARP thì phải dùng map tĩnh thôi.

53. Exhibit:

A network administrator in London has been instructed to prevent all traffic originating on the Paris LAN from entering the Contoso2 router. Which statement would accomplish this filtering?

A. access-list 101 deny ip 192.168.45.0 0.0.0.255 any
B. access-list 101 deny ip 192.168.45.0 0.0.0.0 any
C. access list 101 deny ip 192.168.46.0 0.0.0.0.255 198.168.45.0 0.0.0.255
D. access-list 101 deny ip 192.168.46.0 0.0.0.255 any

Chọn câu A, đây là extended access-list, any là đại diện cho tất cả các địa chỉ của Contoso2 router và access-list này được đặt ở Contoso2 router.

54. Identify three valid host addresses in the 192.168.27.0 network with a subnet mask of 255.255.255.240. (Choose three)
C. 192.168.27.33
D. 192.168.27.112
E. 192.168.27.119
F. 192.168.27.126
G. 192.168.27.175
H. 192.168.27.208

Chọn C, E, F… Các địa chỉ còn lại không là network number thì cũng là broadcast address của các subnet.

55. You are upgrading your Cisco router IOS from a TFTP server over the network. The upgrade procedure is stopped and you are prompted to erase the current flash contents before continuing. What is most plausible reason for this?
A. There is insufficient room for more than one image.
B. The router has detected a copy of the current software image on the TFTP server.
C. The file can be relocated and not compressed.
D. The image to load is a binary executable file

Chọn A, miễn bình luận gì thêm… một nước không thể có 2 vua…

56. At Layer 2 of the OSI model, which component connects a host to the network media?

A. Hub
B. Switch
C. Bridge
D. NIC
E. Transceiver

Chọn B và C, Switch và Bridge, vì chúng xử lý packet dựa vào MAC Address  Layer 2

57. Routercs# show ip route

Codes: C-connected, s-static, l -IGRP, R -RIP, M -mobile, B -BGP, D -EIGRP, EX - EIGRP external, O -OSPF, IA -OSPF inter area, EI -OSPF external type 1, E2 -OSPF external type 2, E -EGP, i -IS-IS, L1 -IS-IS level-1, L2 -IS-IS level-2, * -candidate default, U - per-user static route
Gateway of last resort is not set
R 202.30.8.0 /24[120/1] via 202.30.2.2, 00:00:10, Serial 0
C 202.30.9.0 /24 is directly connected, Serial 1
R 202.30.10.0 /24 [120/7] via 202.30.9.1, 00:00:02, Serial 1
R 202.30.11.0 /24 [120/7] via 202.30.9.1, 00:00:03, Serial 1
C 202.30.1.0 /24 is directly connected, Ethernet 0
C 202.30.2.0 /24 is directly connected, Serial 0
R 202.30.3.0 /24 [120/1] via 202.30.2.2, 00:00:10. Serial 0
R 202.30.4.0 /24 [120/15/ via 202.30.2.2, 00:00:10, Serial 0
R 202.30.5.0 /24 [120/15] via 202.30.2.2, 00:00:10, Serial 0
R 202.30.6.0 /24 [120/15] via 202.30.2.2, 00:00:10, Serial 0
R 202.30.7.0 /24 [120/1] via 202.30.2.2, 00:00:10, Serial 0

You examine the routing table of your router named Routercs. This routing table will be send to neighboring routers via broadcasts. Some routes might be discarded and not entered in to the routing tables of the neighboring RIP routers. Which of the following routes would be discarded in this way?

A. R 202.30.8.0/24 [120/1] via 202.30.2.2, 00:00:10, Serial0
B. R 202.30.11.0/24 [120/7] via 202.30.9.1, 00:00:03, Serial1
C. C 202.30.1.0/24 is directly connected, Ethernet0
D. R 202.30.5.0/24 [120/15] via 202.30.2.2, 00:00:10, Serial0

Chọn D
Theo mmx đã viết là do split-horizon (đồng ý ), nhưng nếu các R path trên không phải học từ một số neighbor router thì sao? Do đó, để giữ cho vấn đề đơn giản, có thể kết luận rằng:
Một số router sẽ bỏ các route A, B, một số thì không, nhưng chắc chắc là router nào cũng sẽ discard route D vì lúc này metric ( hop count đã là 15 rồi ).

59. You work as a network technician at Contoso. You have completed the password recovery procedure on a Cisco router. The process is successful and the router returns to normal operation. What is configuration register value at this point of time?

A. 0x2100
B. 0x2101
C. 0x2102
D. 0x2124
E. 0x2142

Chọn C, lúc này ta đánh lệnh như sau:
Router(config)# config-register 0x2102
Router(config)# reload

Khi này, Router sẽ reload lại và boot từ NVRAM.

60. Your Contoso trainee Boris is configuring a serial interface on a Cisco router. He asks you want encapsulations he can use on the interface.
What should you tell him? (Choose three)

A. Ethernet
B. Token Ring
C. HDLC
D. Frame Relay
E. PPP

Chọn C, D, E

61. You are configuring a network at Contoso main site in Toronto. You use a distance vector routing protocol. What could you use to prevent rooting loops in the network? (Choose two)
A. Link-state advertisements (LSA)
B. Spanning Tree Protocol
C. Shortest path first tree
D. Split horizon
E. Hold-down timers

Chọn D, E

62. Your Contoso trainee Jose are interested in ACL’s (access control lists). He asks you want they can be used for. What should you tell him? (Choose three)
A. Protect hosts from viruses.
B. Classify network traffic.
C. Provide high network availability.
D. Identify interesting traffic for DDR.
E. IP route filtering.
F. Monitor the number of bytes and packets

Chọn B, C, D vì đó là chức năng của access-list mà… :))

63. You work as a network consultant. You are planning a network installation for a large organization named Contoso. The design requires 100 separate subnet works, so Contoso has acquired a Class B network address. What subnet mask will provide the 100 subnet works required, if 500 usable host addresses are required per subnet?

A. 255.255.240.0
B. 255.255.246.0
C. 255.255.252.0
D. 255.255.254.0
E. 255.255.255.0
F. 255.255.255.192

Chọn D, khi đó ta có 128 subnets và mỗi subnet có khoảng 512 IP address…

64. You work as a network technician at Contoso. You are required to establish a Telnet session with a Cisco router. Which commands should you use?

A. Contoso1(config)# line console 0
B. Contoso1(config)# line console 0
C. Contoso1(config)# line console 0
D. Contoso1(config)# line vty 0
E. Contoso1(config)# line vty 0
F. Contoso1(config)# line vty 0

đề này kỳ quá …, vậy là chọn D, E, F rồi …

Mệt quá, nhảy câu thôi !!! :))

are working as a network technician at Contoso. You are required to troubleshooting the WAN link between the Contoso main office at Boston and the Contoso remote office at Rio De Janeiro. A Cisco router that was providing Frame Relay connectivity at the Rio de Janeiro site as replaced with a different vendor's frame relay router. Connectivity is now down between the Boston and Rio De Janeiro site.
What is the most likely cause of the problem?

A. Mismatched LMI types.
B. Incorrect DLCI.
C. Mismatched encapsulation types.
D. Incorrect IP address mapping.

Chọn A, vì thay đổi vendor thì có thể hoạt động khác LMI type với cái ban đầu, còn câu C thì chắc chắn không phải rồi vì encapsulation của nó là frame-relay mà..

Còn B thì cũng không đúng vì theo đề bài thì Boston và Rid De Janerio nối point-to-point với nhau, thì khi đó, mỗi router interface chỉ cần đánh các lệnh: ip address, encapsulation frame-relay và frame-relay lmi-type là nó sẽ tự động chạy rồi…

Còn D thì chuối quá ….


70. Exhibit: o/r 0x2142

You are working with a 2500 series Cisco router. You are performing the password recovery procedure. You have just typed the command shown in the exhibit. Your Contoso trainee Mahmoud is curious on the purpose of this command. What should you tell him? (choose all that apply)

A. To restart the router.
B. To bypass the configuration in NVRAM.
C. To view the lost password.
D. To save the changes to the configuration.
E. To enter ROM Monitor mode.

Chọn B

ur boss at Contoso want you to brief him on differences and similarities between bridges and switches. What should you tell her? (Choose two)

A. Bridges are faster than switches because they have fewer ports.
B. A switch is a multi port bridge,
C. Bridges and switches learn MAC addresses by examining the source MAC address of each frame received.
D. A bridge will forward a broadcast but a switch will not.
E. Bridges and switches increase the size of a collision domain.

Chọn B, C

Câu E là sai vì bridge và switch làm tăng số lượng collision domain, làm giảm size of collision domain.. Câu A cũng sai vì switch hoạt động nhanh hơn bridge vì switch xử lý packet dựa vào hardware còn hub dựa vào software, v.v

72. Your Contoso trainee Bob wants some information regarding the split horizon rule. What should you tell him?

A. Only routers can split boundaries (horizons) between concentric networks.
B. All distance vector protocols require fall back routes that may cause momentary loops as the topology changes.
C. Networks can only remain fully converged if all information about routes is sent out all active interfaces.
D. Information about a route should not be sent back in the direction from which the original update came.
E. Each AS must keep routing tables converged to prevent dead routes from being advertised across the AS boundary.

Chọn D.

73. Your Contoso trainee Ellen is studying the basic of distance vector and link state routing protocols. As her mentor, what could you tell her? (Choose two)

A. Distance vector protocols send the entire routing table to directly connected neighbors.
B. Link state protocols send the entire routing table to all routers in the network.
C. Distance vector protocols send updates about directory connected neighbors to all networks listed in the routing table.
D. Link state protocols send updates containing the state of their own links to all other routers on the network.

Chọn A, D
Link-state protocol chứa toàn bộ database về network, và triggered update, và gửi các update hay routing protocol cho các neighbor router của nó ( như OSPF, EIGRP)…

Distance vector protocl gửi toàn bộ bảng routing table của nó cho các router nối trực tiếp với nó.

74. You have segmented a network into two separate segments, segment 1 and segment2, with a Cisco router. Your boss at Contoso is concerned about the cost, and wants to what the purpose of your action is.

What should you tell him?

A. It increases the number of collisions.
B. It decreases the number of broadcast domains.
C. It connects segment 1's broadcasts to segment 2.
D. It prevents segment 1's broadcasts from getting to segment 2.

Chọn D. Dùng router thì làm tăng số lượng collision domain và broadcast domain, nhưng size của chúng lại giảm xuống… Mục đích chính của việc sử dụng Router đó chính là làm giảm size của broadcast domain nhằm ngăn cản storm broadcast nên chọn câu D là chính xác nhất.

75. Roger is setting up WAN connectivity between the Contoso New York and the Contoso Tokyo offices. He uses a uses two data link layer encapsulations, one for data and one for signaling. Which WAN Service does he use?

A. ISDN
B. Frame Relay
C. ATM
D. FDDI

Chọn A. ISDN sử dụng encapsulation HDLC hay PPP cho kênh B, LABD cho kênh D.

[EIGRP]

Which of the following factors determines the OSPF router ID when configuring a router with both
physical and logical interfaces?
A. The lowest network number of any interface.
B. The highest network number of any interface.
C. The highest IP address of any logical interface.
D. The middle IP address of any logical interface.
E. The lowest IP address of any physical interface.
F. The highest IP address of any physical interface.
G. The lowest IP address of any logical interface.

theo minh nghi cau tra loi C la dung nhat:
C. The highest IP address of any logical interface.

moi moi nguoi cho biet ý kien

[Hajime]

Chọn B: "the highest network number of any interface"

OSPF sẽ chọn ra IP address của bất kỳ interface nào của các router nằm trong mạng broadcast để bầu ra Router ID... Để cho mạng luôn ổn định thì người ta thường sử dụng loop back interface...

Thân chào,

[EIGRP]

Chọn B: "the highest network number of any interface"

OSPF sẽ chọn ra IP address của bất kỳ interface nào của các router nằm trong mạng broadcast để bầu ra Router ID... Để cho mạng luôn ổn định thì người ta thường sử dụng loop back interface...

Thân chào,

Minh xin trích dan tu sach ICND-Cíco Press:

To identify the routers in the neighbor table’s topology database, OSPF uses a router ID (RID) for each router. A router’s OSPF RID is that router’s highest IP address on a physical interface when OSPF starts running. Alternatively, if a loopback interface has been configured, OSPF uses the highest IP address on a loopback interface for the RID, even if that IP address is lower than some physical interface’s IP address.

loopback interface la mot logical interface, nhu vay trong truong hop nay thi cau tra loi C la dúng chứ.
anh Minh có ý kien nao khong a?

[EIGRP]

Re: RE: Một số câu hỏi ôn tập CCNA (phần III)

cam on cac bac ban
cho minh hoi tiep ?

295.QUESTION NO: 295
Your ******** trainee wants to know which VLANs are allowed over a new trunk link that is configured
on an IOS based switch.
What will your reply be?

A. All defined VLANs are allowed on the trunk by default.
B. Each VLAN, or VLAN range, that is specified with the switchport mode command.
C. Each VLAN, or VLAN range, that is specified with the vtp domain command.
D. Each VLAN, or VLAN range, that is specified with the vlan database command.

253.QUESTION NO: 253
You are the network administrator at ********. The RIP routing protocol is being used on the ********
network. RIP is configured with default settings and equal cost load balancing. The ******** network
has six paths with the same metric and administrative distance for a single destination.
Which of the six paths will RIP use to reach the destination?

A. Only the first two paths that are learned.
B. Four of the paths.
C. All six routes in a routed robin fashion.
D. The oldest two paths in the routing table.
E. The first path learned to the destination network.

295.A
253.B(By default, Cisco IOS software includes up to four equal-cost routes to the same subnet in the routing table—essentially as if maximum-paths 4 had been configured.)

[cacodemon]

RE: Một số câu hỏi ôn tập CCNA (phần III)

cho mình hỏi vài câu?

170.QUESTION NO: 170
Which of the following commands should you use if you were asked to apply an access list on a virtual
terminal line of a router?

A. RouterTK(config-line)# access-class 10 in
B. RouterTK(config-if)# ip access-class 23 out
C. RouterTK(config-line)# access-list 150 in
D. RouterTK(config-if)# ip access-list 128 out
E. RouterTK(config-line)# access-group 15 out
F. RouterTK(config-if)# ip access-group 110in

159.QUESTION NO: 159
Which of the following pieces of information is displayed by the show host command? (Select two
options.)

A. The IP addresses of workstations allowed gain access to the router.
B. Permanent name-to-address mappings created using the ip host command.
C. Temporary and permanent DNS entries.
D. The names of the routers created using the hostname command.
E. The length of time a host has been connected via Telnet.

157.QUESTION NO: 157
What are the basic network services that is provided by the Cisco IOS? (Select three options.)

A. Defines topology
B. Access to network resources
C. Routing and switching functions
D. Creation of VLANs
E. Quality of service

[EIGRP]

Re: RE: Một số câu hỏi ôn tập CCNA (phần III)

cho mình hỏi vài câu?

170.QUESTION NO: 170
Which of the following commands should you use if you were asked to apply an access list on a virtual
terminal line of a router?

A. RouterTK(config-line)# access-class 10 in
B. RouterTK(config-if)# ip access-class 23 out
C. RouterTK(config-line)# access-list 150 in
D. RouterTK(config-if)# ip access-list 128 out
E. RouterTK(config-line)# access-group 15 out
F. RouterTK(config-if)# ip access-group 110in

159.QUESTION NO: 159
Which of the following pieces of information is displayed by the show host command? (Select two
options.)

A. The IP addresses of workstations allowed gain access to the router.
B. Permanent name-to-address mappings created using the ip host command.
C. Temporary and permanent DNS entries.
D. The names of the routers created using the hostname command.
E. The length of time a host has been connected via Telnet.

157.QUESTION NO: 157
What are the basic network services that is provided by the Cisco IOS? (Select three options.)

A. Defines topology
B. Access to network resources
C. Routing and switching functions
D. Creation of VLANs
E. Quality of service

170. a
159. b,c
157. a,b,c

[cacodemon]

RE: Một số câu hỏi ôn tập CCNA (phần III)

115.QUESTION NO: 115
OSPF routing makes use of areas. What are the characteristics of these areas? (Choose all that apply.)

A. Hierarchical OSPF networks do not need multiple areas
B. Multiple OSPF areas must connect to area 0
C. Single area OSPF networks must be configured in area 1
D. Areas can be assigned any number from 0 to 63535
E. Area 0 is called the backbone area
F. Each OSPF area need to be configured with a loopback interface

câu này mình chọn B,D,E
đúng không vậy, xin các bạn chi giáo

[VoThanhDuy]

Trong ospf, tất cả các area phải nối về area 0. Area number có thể từ 0 cho đến 65535. Area 0 được gọi là backbone area

[EIGRP]

Re: RE: Một số câu hỏi ôn tập CCNA (phần III)

115.QUESTION NO: 115
OSPF routing makes use of areas. What are the characteristics of these areas? (Choose all that apply.)

A. Hierarchical OSPF networks do not need multiple areas
B. Multiple OSPF areas must connect to area 0
C. Single area OSPF networks must be configured in area 1
D. Areas can be assigned any number from 0 to 63535
E. Area 0 is called the backbone area
F. Each OSPF area need to be configured with a loopback interface

câu này mình chọn B,D,E
đúng không vậy, xin các bạn chi giáo

B,D,E nhưng from 0 to 65535 chứ không phải 63535.
khi đi thi mình có câu này đấy