6.2.6 Practice Questions Network Hardware – Flashcards

Switch Explanation A physical star topology uses a switch or a hub. Routers are used to connect multiple subnets together. A repeater regenerates a network signal so that it can be transmitted for longer distances.

Network interface card Explanation The network interface card (NIC) allows a device to send and receive messages over the transmission media.

It demodulates analogue data from a telephone network into digital PC data. It modulates digital data from the PC into analogue data and transmit it on a telephone. Explanation Modem is shorthand for modulator/ demodulator, Its job is to convert (or modulate) digital data from a PC into analogue telephone signals and transmit them through a telephone network. It also receives analogue data from the telephone network and converts (or demodulates) it into digital PC data.

C0-34-FF-15-01-BE Explantion A MAC or hardware address is a unique identifier hard coded on every network adapter card. A valid MAC address has a total of 12 hexadecimal numbers. Hexadecimal numbers contain the numbers 0 to 9 and the letters A to F. Valid values in a MAC address range anywhere from 00 to FF. Note that one of the answers would be a valid MAC address except it uses a G value, which is beyond the range of a hexadecimal number.

ARP Explanation Hosts use the Address Resolution Protocol (ARP) to discover the hardware address of a host.

Switch Explanation A switch offers guaranteed bandwidth to each port; unlike a hub which shares bandwidth among all the network ports.

It connects multiple cable segments (or devices), and forwards frames to the appropriate segment. Explanation 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.

Hub Explanation 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.

When a frame enters a port, the source MAC address is copied from the frame header. Explanation Bridges and switches learn addresses by copying the MAC address of the source device and placing it into the MAC address table. The port number which the frame entered is also recorded in the table and associated with the source MAC address. The switch or the bridge cannot record the destination MAC address because it does not know the port that is used to reach the destination device. Bridges and switches operate at Layer 2 and do not use IP addresses (which exist at Layer 3).

Send the frame out ports 2-8 Explanation Because the switch does not know the port that is used to reach the destination device, it will send the frame out all ports except for the port on which the frame was received. After the switch learns the port that is used to reach the destination device, it will send the frame out only that port.

Add a network card using a PCI slot. Explanation In this case, you should install a network adapter in a PCI slot. Your computer would then use the new network adapter instead of the one integrated on the motherboard. While installing the new card, you should disable the onboard LAN adapter to prevent it from showing in Device Manager. Replacing the motherboard is too expensive when compared to installing a new expansion card. AGP slots are used for video cards, network cards. Clearing the CMOS settings erases the configuration information but does not fix the LAN adapter that is not functioning.