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IS 404 -- MIDTERM 1 2026 LATEST
QUESTIONS AND ANSWERS| ACE
YOUR GRADES.
Wireless encryption
WEP: Wifi security protocol (lowest form of encryption)
WPA: Wifi Protected Access, more keys used than in WEP
WPA2: most secure
Unicast
Communication where a piece of information is sent from one
point to another point.
Just one sender, and one receiver
Ex. When a browser requests a web page from a server on the
internet, what type of message is sent?
Multicast
Communication where a piece of information is sent from one or
more points to a set of other points
May be one or more senders, and the information is distributed to
a set of receivers (there may be no receivers, or any other
number of receivers)
Watching General Conference uses this mode of transmission
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Ex. When a group of interested devices is sent a communication
simultaneously, such as when an update of routing table info is
sent to interested routers
Broadcast
Information is sent from one point to all other points
Just one sender, but the information is sent to all connected
receivers
Ex. When a client initially requests a MAC address for an IP
address it knows as part of an ARP request
802.11a runs in the _______ range, and 802.11g runs in the
_________ range.
5GHz, 2.4GHz
802.11g
Band: what frequencies does the standard use
Channels: bands are divided into channels
Maximum data transfer rate is 54Mbps
3 channels, 2.4GHz frequency band
TCP
Provides reliable, ordered, and error-checked delivery of packets
Differs from the UDP protocol in that it is CONNECTION-
ORIENTED and keeps track of the ORDER of packets
(sequenced)
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Three-way handshake: SYN-SYN/ACK-ACK
Ex. YouTube
TCP Three-way handshake
A computer initiates a connection by sending a synchronization
request (SYN)
The recipient acknowledges that request (ACK) and also sends a
synchronization request (SYN)
The original sender then acknowledges the original recipient's
synchronizations request (ACK)
TCP Flow Control
TCP will ensure that a sender is not overwhelming a receiver by
sending packets faster than it can consume
TCP Ports
Port: an endpoint to a logical connection and the way a client
program specifies a specific server program on a computer
UDP
Does not guarantee delivery
Can only handle packets of a certain size, might split up package
into multiple smaller packets
Ex. Google Hangouts, FaceTime, Skype
Frame
IS 404 -- MIDTERM 1 2026 LATEST
QUESTIONS AND ANSWERS| ACE
YOUR GRADES.
Wireless encryption
WEP: Wifi security protocol (lowest form of encryption)
WPA: Wifi Protected Access, more keys used than in WEP
WPA2: most secure
Unicast
Communication where a piece of information is sent from one
point to another point.
Just one sender, and one receiver
Ex. When a browser requests a web page from a server on the
internet, what type of message is sent?
Multicast
Communication where a piece of information is sent from one or
more points to a set of other points
May be one or more senders, and the information is distributed to
a set of receivers (there may be no receivers, or any other
number of receivers)
Watching General Conference uses this mode of transmission
, Page | 2
Ex. When a group of interested devices is sent a communication
simultaneously, such as when an update of routing table info is
sent to interested routers
Broadcast
Information is sent from one point to all other points
Just one sender, but the information is sent to all connected
receivers
Ex. When a client initially requests a MAC address for an IP
address it knows as part of an ARP request
802.11a runs in the _______ range, and 802.11g runs in the
_________ range.
5GHz, 2.4GHz
802.11g
Band: what frequencies does the standard use
Channels: bands are divided into channels
Maximum data transfer rate is 54Mbps
3 channels, 2.4GHz frequency band
TCP
Provides reliable, ordered, and error-checked delivery of packets
Differs from the UDP protocol in that it is CONNECTION-
ORIENTED and keeps track of the ORDER of packets
(sequenced)
, Page | 3
Three-way handshake: SYN-SYN/ACK-ACK
Ex. YouTube
TCP Three-way handshake
A computer initiates a connection by sending a synchronization
request (SYN)
The recipient acknowledges that request (ACK) and also sends a
synchronization request (SYN)
The original sender then acknowledges the original recipient's
synchronizations request (ACK)
TCP Flow Control
TCP will ensure that a sender is not overwhelming a receiver by
sending packets faster than it can consume
TCP Ports
Port: an endpoint to a logical connection and the way a client
program specifies a specific server program on a computer
UDP
Does not guarantee delivery
Can only handle packets of a certain size, might split up package
into multiple smaller packets
Ex. Google Hangouts, FaceTime, Skype
Frame
