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Computer Networks → Introduction to Computer Networks 29

IPS stands for
Intrusion Prevention System
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VPN stands for
Virtual Private Network
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IPSec operates at which layer
Network
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AH in IPSec stands for
Authentication Header
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ESP in IPSec stands for
Encapsulating Security Payload
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Man-in-the-middle attack means
Attacker intercepts communication between two parties
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Replay attack uses
Old valid captured packets to gain unauthorized access
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Phishing attack masquerades as
Trusted entity to steal credentials
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SYN flood attack exhausts
Server connection table resources
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Botnet is
Network of compromised machines controlled by attacker
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Zero-day exploit targets
Unknown unpatched vulnerability on day of discovery
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Brute force attack tries
All possible keys or passwords
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Ransomware encrypts victim data and demands
Payment for decryption
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CSRF stands for
Cross-Site Request Forgery
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XSS stands for
Cross-Site Scripting
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FDM stands for
Frequency Division Multiplexing
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TDM stands for
Time Division Multiplexing
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WDM is used in
Fiber optic cables
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OFDM stands for
Orthogonal Frequency Division Multiplexing
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CDMA allows multiple users by
Using unique orthogonal codes
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ATM cell size is
53 bytes
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ATM cell header size is
5 bytes
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Store-and-forward switching receives entire frame then
Checks CRC and forwards
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WPA2 encryption uses
AES
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SSID stands for
Service Set Identifier
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Hidden node problem occurs in
Wireless networks
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RTS/CTS solves
Hidden station problem
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CSMA/CA stands for
Carrier Sense Multiple Access/Collision Avoidance
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WEP was deprecated because
IV too short leading to key recovery attacks
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Computer Networks → Switching Techniques 2

Circuit switching dedicates resources for
Duration of the connection
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Packet switching advantage is
Better resource utilization via statistical multiplexing
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Computer Networks → Wireless Networks 4

802.11b frequency is
2.4 GHz
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802.11a frequency is
5 GHz
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Wi-Fi 6 standard is
802.11ax
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Non-overlapping channels in 2.4 GHz Wi-Fi are
1 6 11
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Computer Networks → Routing Algorithms 5

OSPF uses which routing algorithm
Dijkstra SPF
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OSPF backbone area must be
Area 0
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OSPF DR stands for
Designated Router
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OSPF BDR stands for
Backup Designated Router
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OSPF Type 1 LSA describes
Router links within area
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