CompTIA A+ Practice Tests. Docter Quentin

B. Because bridges work at the Data Link layer, they are aware of only hardware (MAC) addresses. They are not aware of and do not deal with IP addresses. Bridges are more intelligent than repeaters, but they are unable to move data across multiple networks simultaneously.

B. An Ethernet splitter will take the incoming signal on two pairs and then split it, so on the output end it produces two sets of signals using two pairs each. Because of this, Ethernet splitters are limited to 100Mbps connections. It is not recommended that you use Ethernet splitters on a network. If you need to connect multiple computers using UTP, use a hub or a switch.

A. Cable testers are indispensable tools for any network technician. Usually you would use a cable tester before you install a cable to make sure it works. Of course, you can test them after they’ve been run as well.

C. Internet Message Access Protocol (IMAP) is a secure protocol designed to download email. It has several advantages over the older Post Office Protocol 3 (POP3). First, IMAP4 works in connected and disconnected modes. Second, it lets you store the email on the server, as opposed to POP3, which requires you to download it. Third, IMAP4 allows multiple clients to be simultaneously connected to the same inbox.

A. The Domain Name System (DNS) server is responsible for resolving host names, such as www.google.com, to IP addresses to enable communication. If it’s not working properly or you can’t connect to it, you won’t be able to browse the Internet using friendly website names.

B. RG-59 network cable can run for about 228 meters (750 feet). The slightly thicker RG-6 can run for about 304 meters (1,000 feet).

B. Secure Shell (SSH) can be used to set up a secure Telnet session for remote logins or for remotely executing programs and transferring files. Because it’s secure, it was originally designed to be a replacement for the unsecure telnet command.

B, C. Switches and bridges work at Layer 2. Switches are multiport bridges.

B. Computers are able to differentiate where the network ID ends and the host address begins through the use of a subnet mask.

B. Transmission Control Protocol (TCP) guarantees packet delivery through the use of a virtual circuit and data acknowledgments, and User Datagram Protocol (UDP) does not. Because of this, TCP is often referred to as connection oriented, whereas UDP is connectionless.

D. Telnet lets users log into another machine and “see” the remote computer in a window on their screen. Although this vision is text only, the user can manage files on that remote machine just as if they were logged in locally.

C. A CIDR shorthand notation of /26 corresponds to the subnet mask 255.255.255.192.

C. 802.11g specifies a maximum of 54Mbps transmissions in the 2.4GHz frequency range.

C. Server Message Block (SMB) is a protocol used to provide shared access to files, printers, and other network resources. In a way, it functions a bit like FTP only with a few more options, such as the ability to connect to printers, and more management commands.

C. Telnet lets users log into another machine and “see” the remote computer in a window on their screen. Although this vision is text only, the user can manage files on that remote machine just as if they were logged in locally. Telnet uses port 23.

D. A wireless locator or a Wi-Fi analyzer can be either a handheld hardware device or specialized software that is installed on a laptop and whose purpose is to detect and analyze Wi-Fi signals. It can detect where signals are strong or weak to determine whether there are potential security issues.

C. Internet traffic is not encrypted by default. Websites that are secure and encrypt their transmissions will start with HTTPS://rather than HTTP://. These sites can be trusted to encrypt the data, and their identity is verified.