IT Essentials Chapter 6 Applied Networking

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

/8

How many bits are used to represent the OUI part of the MAC address of a NIC card?

24

How many bits are used to represent a MAC address?

48

To avoid interference on a wireless router, how far apart should they be?

5

How many bits are used to represent the host address of a computer with the IP address of 192.168.1.25 and a subnet mask of 255.255.255.0?

8

What does DHCP do?

A Dynamic Host Configuration Protocol (DHCP) server automatically assigns IP addresses, simplifying the addressing process.

If 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.

How many bits are used to represent an IPv6 address?

128

How many bits are used to represent the network address of a host with an IP address of 192.168.150.16 and a subnet mask of 255.255.0.0?

16

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.

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?

Default gateway subnet mask

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?

Disable DHCP Assign static IP addresses to the authorized devices

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

How does DHCP simplify the workstation IP configuration tasks?

In networks with more than a few hosts, DHCP simplifies the addressing process. A DHCP server automatically assigns host IP addresses.

What does MAC address filtering do?

MAC address filtering specifies exactly which device MAC addresses are allowed to or blocked from sending data on your network.

What does port forwarding do?

Port forwarding provides a rule-based method to direct traffic between devices on separate networks. This method provides access to devices across the Internet in a less expensive way than using a DMZ.

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

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 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.

What two default wireless router settings can affect network security?

The SSID is broadcast or a well-known administrator password is set.

The command ipconfig/renew can solve problems with what?

The command ipconfig/renew will cause the computer to request a new IP address from the DHCP server

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 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.

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?

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

If a workstation has been configured with a static IP address and the workstation is moved to another floor what could go wrong?

when a computer is moved from one department to another, it needs a new IP address to connect to the network. When a computer is configured with a static IP address, it will not initiate the process of obtaining a new IP address from DHCP servers.