Study Guide Unit 6

Which protocol dynamically assigns IP addresses to network devices?

DHCP

A user can print to a printer that is on the same network, but the traffic of the user cannot reach the Internet. What is a possible cause of the problem?

The PC default gateway address is missing or incorrect.

A wireless router is displaying the IP address of 192.168.0.1. What could this mean?

The wireless router still has the factory default IP address.

What is the proper CIDR prefix notation for a subnet mask of 255.0.0.0?

/8

The current IP configuration of a small company is done manually and is time-consuming. Because of increased network growth, a technician needs a simpler way for IP configuration of workstations. Which service would simplify the workstation IP configuration task?

DHCP

What two default wireless router settings can affect network security? (Choose two.)

The SSID is broadcast. A well-known administrator password is set.

A computer has been assigned an IP address of 169.254.33.16. What command initiates the process of requesting a new IP address?

ipconfig /release

After having talked to the customer, a network technician suspects that an invalid IP address is the most likely cause of a network issue. Which step of the troubleshooting process does this represent?

Establish a theory of probable cause.

What is the problem if a computer automatically configures an IP address in the 169.254.x.x address range?

The DHCP server is unreachable.

What command can be used to troubleshoot domain name resolution issues?

nslookup

A device has been assigned the IPv6 address of 2001:0db8:cafe:4500:1000:00d8:0058:00ab/64. Which is the network identifier of the device?

2001:0db8:cafe:4500

Which IPv6 address represents the most compressed form of the IPv6 address 2001:0db8:cafe:0000:0835:0000:0000:0aa0/80?

2001:db8:cafe:0:835::aa0/80

Port triggering has been configured on a wireless router. Port 25 has been defined as the trigger port and port 113 as an open port. What effect does this have on network traffic?

All traffic that is sent out port 25 will open port 113 to allow inbound traffic into the internal network through port 113.

A wired network is undergoing several changes that could leave it vulnerable to connection by unauthorized devices while the work is in progress. Which two temporary measures would enable the authorized devices to continue to have network access but prevent unauthorized devices from connecting? (Choose two.)

Assign static IP addresses to the authorized devices. Disable DHCP.

An administrator deploys wireless access points across the office to provide wireless network connectivity to users. Each workstation receives an IP address via DHCP. After a file server with a static IP is connected to the wired network, the administrator receives an IP address conflict message. What is a possible solution?

Change the static IP configured on the file server.

Which network protocol is used to automatically assign an IP address to a computer on a network?

DHCP

Which protocol is used by ping to test connectivity between network hosts?

ICMP

A computer is assigned an IP address of 169.254.33.16. What can be said about the computer, based on the assigned address?

It cannot communicate outside its own network.

Which filtering method uses the physical address to specify exactly which device is allowed or blocked from sending data on a network?

MAC address filtering

Multiple users report that the workstations are assigned a 169.254.x.x IP address. The users are able to communicate only between each other. What is a possible solution?

Restart the DHCP server.

A group of users is unable to connect to the network. When testing several of the PCs and issuing the command ipconfig , the technician notices that all of them have an IP address in the 169.254.x.x range. What is the most likely cause of this problem?

The DHCP server is not operational.

A technician is troubleshooting a problem where the user claims access to the Internet is not working, but there was access to the Internet the day before. Upon investigation, the technician determines that the user cannot access the network printer in the office either. The network printer is on the same network as the computer. The computer has 169.254.100.88 assigned as an IP address. What is the most likely problem?

The computer cannot communicate with a DHCP server.

A new computer workstation has been installed in a small office. The user of the workstation can print a document using a network printer on the LAN, but cannot access the Internet. What is a possible cause of the problem?

The gateway IP address is misconfigured.

A PC is not able to connect to a wired network. Pinging the loopback address is successful, but the gateway cannot be reached. On the network switch all the interface lights are on, except for the interface connected to the PC. The LED on the network card is off. What is the most likely cause of this problem?

The network cable is faulty.

A user reports that the corporate web server cannot be accessed. A technician verifies that the web server can be accessed by its IP address. What are two possible causes of the problem? (Choose two.)

The web server information is misconfigured on the DNS server. The DNS server address is misconfigured on the workstation.

Users in a recently installed wireless network are complaining of slow data transfer and frequent loss of connectivity. The technician checks that the wireless security is correctly implemented, and there is no evidence of unauthorized users on the network. Which two problems might the technician suspect? (Choose two.)

The wireless signal is too weak. There is interference from outside sources.

A workstation has been moved from the first floor to the fifth floor within an organization. The user is now reporting that the workstation cannot connect to the network. A technician suspects that the workstation could not obtain an IP address from a DHCP server. What is a possible cause of the problem?

The workstation has been configured with a static IP address.

What is a result when the DHCP servers are not operational in a network?

Workstations are assigned with IP addresses in the 169.254.0.0/16 network.

A network technician is checking a computer to see if the DHCP client is working correctly. The technician issues the ipconfig /all command. Which two parameters should the technician review? (Choose two.)

default gateway subnet mask

What security technique could provide secure access to a server located in a small office without the expense of implementing a DMZ or purchasing a hardware firewall?

implement port forwarding

A technician troubleshooting a network problem has used CLI commands to determine that a computer has not been allocated a correct IP address from the DHCP server. Which command can the technician use to solve this problem?

ipconfig/renew

A customer has a web server for a small business. The business uses both wired and wireless networking. A Linksys WRT300N wireless router provides wireless and wired connectivity. What firewall option may be enabled in order for customers to gain access to the web server from their remote locations?

port forwarding

Which network server is malfunctioning if a user can ping the IP address of a web server but cannot ping the web server host name?

the DNS server

A technician wishes to update the NIC driver for a computer. What is the best location for finding new drivers for the NIC?

the website for the manufacturer of the NIC

A technician is configuring the channel on a wireless router to either 1, 6, or 11. What is the purpose of adjusting the channel?

to avoid interference from nearby wireless devices

Which filtering method uses IP addresses to specify allowed devices on your network?

whitelisting