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Nt1310 Unit 3 Assignment 1

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a) A bridge connects two Local Area Network (LAN) segments that use the same protocol into one larger continuous LAN. It functions at the Media Access Control (MAC) Sublayer of OSI's Datalink Layer. When a packet is received by the bridge, it looks at the MAC address of the destination device and compares it with the addresses in its lookup table. The lookup table maps the port numbers with the respective MAC addresses. If the address is in the lookup table, the packet is sent to its intended recipient through the port number. If not, locally originated packets are broadcast over the network and inbound packets are discarded. By filtering packets that travel through bridges, operators can restrict user access to various network resources. (Brown, 1992) Thus, bridges help to reduce traffic congestion, improve speed, and increases device security.

b) A router interconnects networks of the same protocol but of different …show more content…
Modulation is the process of changing the form of signal received (from digital to analog), while demodulation is the process of extracting information from the signal that has been received and modulated (by conversion from analog to digital). This is important because telephone lines are unable to carry digital signals, while computers can only understand digital signals which are made up of 1s and 0s. A DSL modem requires a network access phone number and logon credentials in order to establish the connection, unlike wireless modems which do not require wires and at times do not require credentials. A DSL modem is also involved in error correction of the data received. It breaks up data packets into frames and attaches a checksum to each frame. If the frame does not match the checksum, the modem will request for the frame to be retransmitted. (Silva,

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