COMPTIA A+ Test Questions - Networking

Which data transmission rate is defined by the IEEE 802.11b wireless standard? 11 Mbps 150 Mbps 54 Mbps 10 Mbps 2 Mbps

11 Mbps The IEEE 802.11b standard defines wireless transmission rates up to 11 Mbps. 802.11b wireless network interface cards and wireless access points (also called wireless hubs or wireless routers) will automatically negotiate the best transmission speed up to 11 Mbps based on current network traffic load and the quality of the wireless connection between the client and access point. The wireless communications are affected by distance, dense physical obstructions, and other electromagnetic interference producing devices. IEEE 802.11a and 802.11g defines wireless transmission rates up to 54 Mbps. The IEEE 802.3 standard defines Ethernet 10baseT cable based transmissions of 10 Mbps. IEEE 802.11n defines wireless transmission rates of 150 and 300 Mbps.

Which of the following are valid IP addresses? (Select TWO.) 10.384.0.3 172.16.1.26 254.7.1.417 256.0.0.1 2.2.2.2 1.254.1.1024 192.168.1.512

2.2.2.2 172.16.1.26 A valid IPv4 address consists of four 8-bit (1 byte) numbers separated by periods. For example, 10.0.0.65 is a valid IP address. Because they are e8 bits long, these numbers are frequently called octets. Even though we typically express these numbers using decimal notation, it's important to remember that these numbers are binary numbers. The lowest value one of these numbers can have is 00000000. The decimal equivalent for this number is simply 0. The highest value one these numbers can take is 11111111. The decimal equivalent of this number is 255. Therefore, in decimal notation, each octet must contain a number between 0 and 255.

To access your company's internal network from home, you use Secure Shell (SSH). The administrator has recently implemented a new firewall at the network perimeter and disabled as many ports as possible. Which port needs to remain open so you can still work from home? 23 21 443 80 22

22 SSH uses port 22. This port would need to remain open for you to access your company's internal network from home. SSL uses port 443, FTP uses port 21, and HTTP uses port 80. Telnet uses port 23.

Which of the following is the best definition for a LAN The interconnection of components, such as laptops, printers, keyboards, and other wireless devices within a personal range (typically 10 meters or less). A network whose computers and servers are separated geographically, but still connected. A network in a small geographic area, like in an office. An extension of a private network over a shared or public network, such as the internet.

A network in a small geographic area, like in an office.

Which of the following tools can help prevent damage when working with computer components? Tone generator and probe Antistatic pad and wrist strap IC insertion and extraction tool Three-pronged parts retriever

Antistatic pad and wrist strap

You need a type of wireless connection that can transfer data between your phone, PDA, and laptop. You are transferring sensitive information. Which of the following would be the BEST choice? Bluetooth Cellular WAN Wireless Ethernet Infrared

Bluetooth A Bluetooth connection would be the best choice because it automatically detects Bluetooth-enabled devices and creates a wireless PAN between them. It can be used for both voice and data signals, and it also provides 128-bit encryption to protect sensitive information in transit. Infrared is a line-of-sight medium, so it may be difficult to maintain connectivity. It doesn't provide encryption. Cellular WAN provides very little security for information in transit and requires a cellular connection for each device. Wireless Ethernet is used to transfer data, not to connect devices.

A group of workers attend a team-building retreat at a remote cabin. They can place calls on their mobile smartphones, but the cabin has no wired phone, television, or wired internet connectivity. The workers need to access an internet webpage using their laptop computers. Which of the following internet connection types might be available to the workers? Cellular DSL Dial-up Cable

Cellular

Currently, the users in your company are required to use their IP addresses when connecting to other hosts. Since IP addresses are difficult to remember, you want to implement a protocol on your network that allows computers to automatically find another host's IP address using a logical name. Which of the following protocols would be the BEST to implement? DNS DHCP ARP Telnet

DNS Domain Name System (DNS) is an internet service that translates domain names into IP addresses. Because domain names are alphabetic, they're easier to remember. For example, the name www.mydomain.com would be identified with a specific IP address. ARP is a protocol for finding the IP address from a known MAC address. DHCP is a protocol used to assign IP addresses to hosts. Telnet is a remote management utility.

A homeowner's connection to the internet is through an always-on modem that connects to existing telephone wiring and has a download speed of over 3 Mbps. The homeowner is able to make analog phone calls over the same wiring at the same time. Which of the following internet connection types is being used? Dial-up ISDN DSL Cable

DSL Digital Subscriber Line (DSL) uses a modem that connects to copper telephone lines, allows the use of the internet and phone calls at the same time, and has average download speeds of 3 Mbps to 7 Mbps. Dial-up internet is an older technology that converts digital signals to analog signals that are sent an received over telephone wiring. Consequently, the modem and a phone cannot be used at the same time. ISDN is an older technology that uses telephone lines. Its maximum bandwidth is 128 Kbps. Cable internet connections use a modem that connects to coaxial cables traditionally used to provide cable television.

A technician is configuring the static TCP/IP settings on a client computer. Which of the following configurations are needed for internet communications? (Select THREE.) APIPA address Default gateway address WINS address Alternate IP address DHCP server address IP address including a subnet mask (IPv4) or subnet prefix length (IPv6) DNS server address

Default gateway address IP address including a subnet mask (IPv4) or subnet prefix length (IPv6) DNS server address

Which of the following hardware devices regenerates a signal out all connected ports without examining the frame or packet contents? Router Hub Bridge Switch Gateway

Hub A hub and a repeater send received signals out all other ports. These devices do not examine the frame or the packet contents. A switch or a bridge use the MAC address in a frame for forwarding decisions. A router uses the IP address in a packet for forwarding decisions.

You are setting up a small network in your office with one Windows server and 50 Windows workstations. You want to spend as little time as possible configuring the workstations with IP addressing information. What should you do? Install the WINS service on your server. Install and configure the DHCP service on your server. Install the DHCP service on each workstation. Assign each user an IP address and instruct the user to enter the IP address in his or her computer.

Install and configure the DHCP service on your server The DHCP protocol allows you to assign IP addresses automatically. In this scenario, you should configure the DHCP service to run on the network server. The DHCP client on each workstation can then contact the DHCP server when the workstations connect to the network to be automatically assigned IP addressing information. You could instruct each user to manually enter IP addressing information, but this creates a higher chance of error and will likely require more administrative overhead.

Which of the following best describes how a switch functions? It connects multiple cable segments or devices and forwards frames to the appropriate segment. It connects multiple segments of different architectures. It translates frames and broadcasts them to all of its ports. It connects multiple cable segments or devices and broadcasts frames to all of its ports. It connects multiple segments of different architectures. It translates frames and forwards them to the appropriate segment.

It connects multiple cable segments or devices and forwards frames to the appropriate segment Switches have multiple ports and can connect multiple segments or devices. The switch forwards frames to the appropriate port. They function similarly to a hub except, instead of sending packets to all ports, switches send packets only to the destination computer's port.

Which tool would you use to measure electrical properties such as voltage, amps, and resistance IC extractor Mini electronic combination wrench set Multimeter Cable tester

Multimeter

Which protocol is used to send email messages from a mail client to a mail server? SNMP POP3 FTP SMTP IMAP

SMTP SMTP sends email from a mail client to a mail server. FTP provides a generic method for transferring files. SNMP is used in network management systems to monitor network-attached devices for conditions that warrant administrative attention. POP3 and IMAP are both email protocols used by mail clients to retrieve email from a mail server; however, they can't be used to send mail from the client to the server. The Trivial File Transfer Protocol (TFTP) is used for network file transfers.

What device is used to create a physical star topology? Repeater Switch Router Bridge

Switch

Which of the following BEST describes the purpose for which loopback plugs are used? Grabbing and lifting small objects. Connecting computers together without using network cards or modems. Removing broken pins within sockets. Testing ports by returning output signals as input.

Testing ports by returning output signals as input

While investigating a network connectivity issue, a technician finds that the link light on a workstation is not lit, and there is no connectivity after replacing the patch cable with one that is known to be good. The wall jack is not labeled, and within the switch room, none of the cables or patch panel ports are labeled. Which of the following tools would the technician MOST likely use next? Cable tester Punchdown tool Tone generator Crimper

Tone generator A tone generator can be used to identify which port in the patch panel connects to the wall jack. The technician could then investigate further by following the cable from the patch panel to the switch. A cable tester might be used after the correct cable and patch panel port are identified. A crimper is used to attach an RJ45 or RJ11 end to a twisted pair cable. A punchdown tool may be needed later if the identified cable is not attached correctly to either the wall jack or the patch panel. If the cable is not identified, the cable can't be repaired.