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802.11 DSSS
a) Direct sequence spread spectrum in a 2.4 GHz band
b) Each bit is replaced by a sequence of bits called a chip code, implemented at the physical layer
c) Sender splits each byte of data into several parts and sends them concurrently on different frequencies
d) Data rate is 1 or 2 Mbps
Physical layers defines with synchronizing the 1s and 0s on the wire.
What are the basic LAN topologies? The three simple LAN topologies that are combined to shape any practical topology are called as basic LAN topologies. They are, Bus Topology
Connecting Devices of bridges - Five kinds: - Repeaters - Hubs - Bridges - Two- and three-layer switches - Repeaters and hubs - layer one of Internet model -
Question Approximately what is the low frequency cut-off of the band-pass filter shown in the figure?
What is primary and secondary ring One of the two FDDI rings is known as the primary ring; the other is called the secondary ring. The primary ring is utilized for data tra
Selective Repeat (SR) Selective repeats is a connection oriented protocols in which transmitter and receiver have a window of sequence numbers. SR scheme avoids the unne
The Data link layer performs the following: Responsible for physically passing data from single node to another. Translates messages from the upper layers into data frames and adds
Address Resolution Protocol resolves the MAC address if the IP address is known. It is a layer 3 protocol.
What is Microwave? Microwaves have been used in data communications. Microwave has a higher frequency than radio waves and thus can handle larger amounts of data.
Question: (a) What is a script kiddie? Is it a significant security threat, and why? (b) Assume that UNIX uses the user login name in lieu of the traditional salt, what is
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