CompTIA Network+ Certification (N10-003) Part 20
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30 CompTIA Network+ questions covering troubleshooting
- 1.
You work as a network administrator. The network has 200 Windows 98 workstations and 150 Windows XP Professional workstations. You replace the WINS server on the network with a DNS server. The new DNS server has a different IP address and you update the DHCP server to reflect this change. Which workstations will be able to use the new DNS server?
- A.
Any workstation that has not released and renewed their DHCP lease
- B.
Any Windows 98 workstation that has released and renewed their DHCP lease
- C.
Any Windows XP Professional workstation that has released and renewed their DHCP lease
- D.
Any Windows XP Professional workstation that has not released and renewed their DHCP lease
Correct Answer
C. Any Windows XP Professional workstation that has released and renewed their DHCP leaseExplanation
Workstations must release and renew their DHCP leases in order to receive the new configuration that has been updated on the DHCP server. Once they receive this new configuration, they will be able to access the new DNS server. However, Windows 98
uses NetBIOS names and not domain names. Therefore only the Windows XP Professional workstations that have released and renewed their DHCP lease will use the new DNS server.Rate this question:
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- 2.
You work as a network administrator. You have removed the DNS server from the network for maintenance purposes. What affect will this have on the workstations in the network?
- A.
They will not be able to locate a server by NetBIOS name
- B.
They will not be able to locate as server by MAC address
- C.
They will not be able to locate a server by IP address
- D.
They will not be able to locate a server by host name
Correct Answer
D. They will not be able to locate a server by host nameExplanation
DNS is responsible for host name to IP address resolution. Thus, if the DNS server is down, name resolution from host name to IP address will not be possible; thus DNS clients will not be able to locate a server by host name.Rate this question:
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- 3.
You work as a network administrator and you install a proxy server. What effect will this have on the network?
- A.
Reduced network collisions
- B.
Reduced Internet traffic
- C.
Reduced DHCP traffic
- D.
Reduced broadcast traffic
Correct Answer
B. Reduced Internet trafficExplanation
A proxy server handles traffic to the Internet on behalf of the clients on the internal network. It can be configured to control which the Internet requests can be permitted and which will be denied. This will control which web sites users can access and which they cannot, and can cache frequently requested Web pages, reducing Internet bandwidth usage.Rate this question:
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- 4.
You work as the network administrator. You install a VLAN on the network to create two subnets. However, users on one subnet cannot access servers on the other subnet. What should you do to resolve this problem?
- A.
Install a router between the two subnets
- B.
Install a DHCP server in each subnet
- C.
Install a proxy server in each subnet
- D.
Install a DNS server in each subnet
Correct Answer
A. Install a router between the two subnetsExplanation
To forward traffic between two subnets, we would need a router.Rate this question:
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- 5.
You work as a network administrator. Your network has two Windows 2000 servers, one Novell NetWare 6.5 server and 250 Windows 2000 Professional workstations. You add 10 new Windows XP Professional clients to the network. However, users of the new clients complain that they cannot connect to the NetWare server. They can connect to the Windows 2000 servers. Other users do not have the same problem. What is the most probable cause of this problem?
- A.
Gateway Services for NetWare (GSNW) has not been installed on the new clients
- B.
Client Services for NetWare (CSNW) has not been installed on the new clients
- C.
File and Print Services for NetWare (FPNW) has not been installed on the new clients
- D.
NDS has not been configured on the new clients
Correct Answer
B. Client Services for NetWare (CSNW) has not been installed on the new clientsExplanation
Client Services for NetWare (CSNW) is required for a Windows workstation to access NetWare servers. It seems CSNW has not been installed on the new clients.Rate this question:
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- 6.
You work as a network administrator. Your network has 100 Windows 98 clients, 125 Windows XP clients, and one Windows 2000 server. DHCP is not in use on the network. You add a second server and install WINS. What must you do next to ensure the network remains fully operational?
- A.
Update the LMHOSTS file on each client
- B.
Update each Windows 98 client with the WINS server address
- C.
Update the DNS server with the host name and IP address of the WINS server
- D.
Do nothing. The network is fully operational
Correct Answer
B. Update each Windows 98 client with the WINS server addressExplanation
WINS is responsible for NetBIOS name to IP address resolution for Windows 9x computers. We have changed the WINS server; therefore the Windows 98 clients need to be updated with the address of the new WINS server.Rate this question:
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- 7.
You work as a network technician. Your network has 500 Windows 98 clients and three Windows 2000 servers. You decide to segment the network and install a router to connect the two segments. What must you install to accommodate the Windows 98 clients that use NetBIOS?
- A.
The DHCP service
- B.
The WINS service
- C.
The DNS service
- D.
The SMTP service
Correct Answer
B. The WINS serviceExplanation
WINS is responsible for NetBIOS name to IP address resolution for Windows 9x computers.Rate this question:
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- 8.
You work as a network administrator. You have just replaced the old DNS server with a new one. During the upgrade you have changed the IP address used by the DNS service. The DHCP server was updated to reflect this change. After the replacement of the DNS server you start receiving reports that certain computers are connecting to the new DNS server while others are not. Which computers are most likely connecting to the new server?
- A.
Any computer that has not released and renewed their DHCP lease
- B.
Any statically assigned workstation
- C.
Any computer that has released and renewed their DHCP lease
- D.
Any computer that does not have a NIC
Correct Answer
C. Any computer that has released and renewed their DHCP leaseExplanation
Computers must release and renew their DHCP leases in order to receive the new configuration that has been updated on the DHCP server. Once they receive this new configuration, they will be able to access the new DNS server.Rate this question:
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- 9.
You work as a network administrator. You have been asked to change the lease time of the DHCP scope from one week to one day. But before you change the lease time your boss wants to know what effect this might have on the end users. How do you answer?
- A.
The users will be logged out every 24 hours unless they logout on their own when they leave the office
- B.
Ight after the lease time has been changed, the users will have to manually release and renew their IP addresses in order to continue working on the network
- C.
The users will not be affected by the change
- D.
The users will loose network connectivity during the remaining duration of the previous DHCP lease. Once the previous lease has expired a new can be obtained with the new lease time
Correct Answer
C. The users will not be affected by the changeExplanation
Changing the lease time will not affect the currently assigned IP configurations. The current IP settings will still be valid but will now be renewed earlier. Thus, the users will not be affected by the change.Rate this question:
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- 10.
You work as a technician. You receive a call from the senior network technician stating that your DNS server has suffered a catastrophic failure and is down at the moment. Your boss wants to know what affect will this have on the workstations in the office. How do you answer?
- A.
They will be unable to renew their IP addresses if their DHCP lease time expires
- B.
They will be unable to reference a server by host name, but resolving by IP address will still work
- C.
They will be unable to reference a server by NetBIOS name, but resolving by host name will still work
- D.
They will be unable to renew their IPX address once the lease expires
Correct Answer
B. They will be unable to reference a server by host name, but resolving by IP address will still workExplanation
DNS is responsible for host name to IP address resolution. Thus, if the DNS server is down, name resolution from host name to IP address will not be possible; thus DNS clients will not be able to reference a server by host name.Rate this question:
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- 11.
You work as a network administrator on a network with two subnets, A and B. You have two DHCP servers, one in each subnet, to provide dynamic IP addressing. The DHCP server in subnet A fails. What can you do to temporarily use the working DHCP server in subnet B while you repair the failed one in subnet A?
- A.
Install a proxy server on subnet A
- B.
Install a DHCP relay agent on a server in subnet A
- C.
Install a DHCP relay agent on the DHCP server in subnet B
- D.
Install a DHCP relay agent on a server in subnet B
Correct Answer
B. Install a DHCP relay agent on a server in subnet AExplanation
The DHCP server in Subnet A failed so we can assume that the DHCP clients on Subnet A cannot reach a DHCP server to renew their DHCP leases. This can be overcome by installing a DHCP relay agent on the affected subnet.Rate this question:
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- 12.
You are working as a network technician. The computers on your network use static IP addresses. A rogue residential gateway that is running DHCP is installed on the network. What problem might occur?
- A.
Computers may have difficulty accessing the Internet
- B.
The computers IP addresses will change
- C.
There will be no problems
- D.
There will be a routing loop between the residential gateway and the original router
Correct Answer
A. Computers may have difficulty accessing the InternetExplanation
The network computers have statically assigned IP addresses but the gateway address might not be configured. If that's the case the computers on the network might use the rouge gateway and would not be able to connect to the Internet.Rate this question:
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- 13.
You work as a network administrator. Your boss has requested that you examine the possibility of reducing the bandwidth used between your network and the Internet. Which of the following suggestions would help you accomplish this if installed in the network?
- A.
VPN (Virtual Private Network) server
- B.
Proxy server
- C.
DHCP server
- D.
HTTP server
Correct Answer
B. Proxy serverExplanation
A proxy server handles traffic to the Internet on behalf of the clients on the internal network. It can be configured to control which the Internet requests can be permitted and which will be denied. This will control which web sites users can access and which they cannot, reducing Internet bandwidth usage.Rate this question:
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- 14.
Which of the following workstations will be affected when a single link on a physical bus network fails?
- A.
The workstation directly connected to the failed link
- B.
The workstations downstream from the failed link
- C.
The workstations upstream from the failed link
- D.
All the workstations on the network
Correct Answer
D. All the workstations on the networkExplanation
A bus topology has a very low fault tolerance. A failure of any node on the network will bring the entire network down.Rate this question:
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- 15.
Which of the following workstations will be affected when a single station on a physical ring network fails?
- A.
The workstations directly connected to the failed station
- B.
The workstations downstream from the failed station
- C.
The workstations upstream from the failed station
- D.
All the workstations on the network
Correct Answer
D. All the workstations on the networkExplanation
A ring topology has a very low fault tolerance. A failure of any node on the network will bring the entire network down.Rate this question:
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- 16.
You work on an Ethernet network. Should a link on your network fail, which workstations will be affected?
- A.
The workstations upstream from the failed link
- B.
All the workstations on the network
- C.
Only the workstation attached to the failed link
- D.
None of the workstations
Correct Answer
C. Only the workstation attached to the failed linkExplanation
An Ethernet network uses the star topology in which every node is connected to a central distribution device such as a hub or switch. A failure of any node on this network will only affect the node that is down.Rate this question:
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- 17.
How will a failure of a router on a network with two VLANs affect communication?
- A.
The entire network will be down
- B.
The network will remain fully operational
- C.
Communication between VLANs will be affected
- D.
All workstations connected to the router will be affected
Correct Answer
C. Communication between VLANs will be affectedExplanation
Although a switch is used to create VLANs, a router is required to forward traffic from one VLAN to the other as each VLAN is a subnet. A router connects two subnets together and is responsible for forwarding traffic between the subnets. Thus, if the router fails communication between the VLANs will be affected.Rate this question:
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- 18.
How will a failure of a router on a network with two subnets affect communication?
- A.
The entire network will be down
- B.
The network will remain fully operational
- C.
Communication between subnets will be affected
- D.
All workstations connected to the router will be affected
Correct Answer
C. Communication between subnets will be affectedExplanation
A router connects two subnets together and is responsible for forwarding traffic between the subnets. Thus, if the router fails communication between the subnets will be affected.Rate this question:
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- 19.
How will a failure of a switch on a routed network with two subnets affect communication? (choose all that apply)
- A.
The entire network will be down
- B.
The network will remain fully operational
- C.
Communication between subnets will be affected
- D.
The subnet with the failed switch will be affected
Correct Answer(s)
C. Communication between subnets will be affected
D. The subnet with the failed switch will be affectedExplanation
All workstations in subnet are connected to the switch, which is in turn connected to the router. When the switch fails, all nodes connected to it, including the router will be affected. Thus communication between the two subnets will not be possible, and the nodes connected to the switch will not have network connectivity.Rate this question:
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- 20.
Which of the following workstations will be affected when a single link on a full-mesh network fails?
- A.
The workstations directly connected to the failed link
- B.
The workstations downstream from the failed link
- C.
The workstations upstream from the failed link
- D.
All the workstations on the network
- E.
None of the workstations
Correct Answer
E. None of the workstationsExplanation
A full-mesh network has multiple links per host and is fault tolerant. A failure of any single link will not affect the network.Rate this question:
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- 21.
You work on a token bus network. If a break occurs in the network cable how will this affect the network?
- A.
The network will be split into two token bus networks
- B.
The nodes downstream from the break will have no network connectivity
- C.
The nodes upstream from the break will have no network connectivity
- D.
The network will collapse
Correct Answer
D. The network will collapseExplanation
A bus topology has a very low fault tolerance. It requires terminators at either end of the cable to absorb electronic signals so that they are not reflected back on the media. A failure in the cable will bring the entire network down.Rate this question:
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- 22.
Should a break occur in the cable of an Ethernet network, what will be offline?
- A.
All hosts on the network
- B.
The host directly connected to the failed cable
- C.
The hosts upstream from the failed cable
- D.
None of the hosts on the network
Correct Answer
B. The host directly connected to the failed cableExplanation
An Ethernet network uses the star topology in which every node is connected to a central distribution device such as a hub or switch. A failure of any node on this network will only affect the node that is down.Rate this question:
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- 23.
If a break happens in the cable of a token ring network occurs, what will happen?
- A.
The network will revert to a token bus network
- B.
The nodes downstream from the break will have no network connectivity
- C.
The nodes upstream from the break will have no network connectivity
- D.
The network will collapse
Correct Answer
D. The network will collapseExplanation
A token ring has a very low fault tolerance and a failure in the cable will bring the entire network down.Rate this question:
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- 24.
You are working as a network technician. The computer labs are still using a physical bus network. Which of the following could cause a complete network failure on the computer labs network?
- A.
One of the networked workstations is powered off
- B.
One of the networked workstations is using the DLC (Data Link Protocol)
- C.
A terminator has been removed from the end of the bus trunk cable
- D.
A terminator has been installed on the end of the bus trunk cable
Correct Answer
C. A terminator has been removed from the end of the bus trunk cableExplanation
The two open ends of the bus trunk cable must be terminated to prevent signal bounce. Should the terminator be removed, the entire network will fail. The entire network will also fail if a single connector becomes faulty or a break in the bus trunk cable occurs.Rate this question:
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- 25.
You work as a network administrator. You are sent to one of your branch offices to investigate a network problem. The network at the branch office consists of twenty Windows XP workstations that are wired to a switch. The switch is connected to a router for Internet access. One of the users at the branch office reports that she is unable to access the Internet. All other users can access the Internet. Which of the following items should you check to solve the problem?
- A.
The network card of the problematic machine, the port on the switch that uplinks to router, and the patch cable from the problematic machine to the switch.
- B.
B. The patch cable from the problematic machine to the switch, the port on switch that the problematic machine is plugged into, and the external interface on the router
- C.
The network card of the problematic machine, the port on the switch that the problematic machine is plugged into, and the patch cable from the problematic machine to the switch
- D.
The port on the switch that the problematic machine is plugged into, the network card of the problematic machine, and the uplink port on the switch
Correct Answer
C. The network card of the problematic machine, the port on the switch that the problematic machine is plugged into, and the patch cable from the problematic machine to the switchExplanation
The problem is affecting only one user. Therefore we should assume that the problem is related a networking element from the user's computer to the switch. This could be the NIC on the problem computer, the cable that attached the problem computer to the switch, or the port on the switch to which the problem computer is connected.Rate this question:
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- 26.
You work as a network engineer. You manage six workstations that are named Workstation1 through Workstation6. The workstations are installed sequentially in a physical ring topology. One day Workstation3 fails and you need to send it back to the manufacturer for service. How would you remove Workstation3 from the network without moving the other workstations?
- A.
Connect Workstation 2 and Workstation 4 using a barrel connector
- B.
Add a 75 ohm terminator to Workstation 2 and Workstation 4
- C.
Connect Workstation 2 and Workstation 4 using an RJ-45 coupler
- D.
Add a 50 ohm terminator to Workstation 2 and Workstation 4
Correct Answer
A. Connect Workstation 2 and Workstation 4 using a barrel connectorExplanation
The physical ring topology consists of a closed continuous loop of cable in which each computer is connected to the computer in front of it and the computer behind it in the ring. Data is transferred in only one direction from one node to the next by means of a token. Because data can move in only one direction, a failure of a single node can cause disruption to the entire network. Should a failure occur, you can use a barrel connector to bypass the faulty node.Rate this question:
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- 27.
You work as a network engineer. You manage ten workstations numbered 1 through 10. All ten workstations are installed sequentially on a physical bus network. Your boss has requested that you separate workstations 1 through 5 and workstation 6 through 10 into two separate networks and move the first 5 workstations to another department. You cut the cable between workstations 5 and 6. What else, if anything, must you do to complete the job?
- A.
Do nothing; the job has been successfully completed
- B.
Install a terminator on the severed end of the bus trunk cable connecting workstations 1 through 5
- C.
Install a terminator on the severed end of the bus trunk cable connecting workstations 6 through 10
- D.
Install terminators on both severed ends of the bus trunk cable
Correct Answer
D. Install terminators on both severed ends of the bus trunk cableExplanation
In a bus topology, the bus trunk cable must be terminated at both ends. Therefore you must install terminators on both severed end of the bus trunk cable.Rate this question:
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- 28.
You are an administrator on a network with several workstations that have wireless 802.11g network adapters. Every day at around lunchtime wireless users complain of loss of connectivity. What can you do to this problem?
- A.
Replace the WAP with an 802.11b WAP
- B.
Move the WAP away from the kitchen
- C.
Configure the wireless workstations and the WAP to operate in ad-hoc mode
- D.
Connect the WAP directly to the network
Correct Answer
B. Move the WAP away from the kitchenExplanation
802.11g uses the 2.4 GHz range which is also used by appliances such as microwaves. The connectivity problem occurs at around lunch time, which seems to indicate that the increased use of microwaves at around this time is causing RFI (Radio Frequency Interference). We should thus attempt to eliminate this RFI.Rate this question:
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- 29.
You are the network administrator of a network which consists of two subnets. One subnet contains all workstations and the other contains all servers. Users complain that they cannot access the servers in the remote subnet. You cannot ping any of the workstations by either host name or IP address but you can ping the other servers. What is the probable cause of this problem?
- A.
The DNS server is offline
- B.
The DHCP server is offline
- C.
The router is offline
- D.
The gateway is offline
Correct Answer
C. The router is offlineExplanation
A router connects two subnets together and is responsible for forwarding traffic between the subnets. In this scenario, communication between the subnets is affected. Communication within the subnet is not affected as we can ping other servers in the subnet; thus, the router has failed.Rate this question:
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- 30.
You work as a network technician. A user has entered the wrong WEP key into a wireless device. Which of the following symptoms will occur?
- A.
Data can be sent but not received
- B.
The network cannot be accessed
- C.
Data cannot be sent but can be received
- D.
The network can only be accessed using the Service Set Identifier
Correct Answer
B. The network cannot be accessedExplanation
WEP requires that both the wireless computer and the WAP be configured with the same encryption key in order for the two to communicate. If one of the two has the wrong WEP key, communication will not be possible and the network will not be accessible.Rate this question:
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Mar 05, 2024Quiz Edited by
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Sep 27, 2010Quiz Created by
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