Quick Revision

GK One-Line Question & Answer

15541+ short questions with short answers, covering every category and sub-category on the site — no long articles to scroll through. Good for a fast recap before an exam, or a few minutes of daily practice.

Computer Networks → Subnetting 1

Subnet mask for /22 is
255.255.252.0
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Computer Networks → Introduction to Computer Networks 10

APIPA range is
169.254.0.0/16
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Private IP range for Class A is
10.0.0.0/8
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Private IP range for Class B is
172.16.0.0/12
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Private IP range for Class C is
192.168.0.0/16
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Class D addresses are used for
Multicast
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SLAAC stands for
Stateless Address Autoconfiguration
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6to4 tunneling encapsulates
IPv6 in IPv4
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Dual stack means device supports
Both IPv4 and IPv6
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Traceroute identifies path by
Incrementing TTL values and reading ICMP Time Exceeded responses
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ARP request is sent as
Broadcast
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Computer Networks → Network Layer 12

IPv6 link-local prefix is
FE80::/10
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IPv6 multicast addresses start with
FF00::/8
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IPv6 loopback address is
::1
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NDP in IPv6 replaces
ARP
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ICMPv6 Neighbor Solicitation type is
135
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ICMPv6 Router Advertisement type is
134
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ICMP type 0 is
Echo Reply
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ICMP type 8 is
Echo Request
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ICMP type 3 is
Destination Unreachable
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ICMP type 11 is
Time Exceeded
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ICMP type 5 is
Redirect
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Ping uses which ICMP types
0 and 8
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Computer Networks → Application Layer 2

DHCP uses which transport protocol
UDP
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DHCP DORA process stands for
Discover Offer Request Acknowledge
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Computer Networks → Transport Layer 15

TCP stands for
Transmission Control Protocol
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UDP stands for
User Datagram Protocol
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TCP is
Connection-oriented
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UDP is
Connectionless and unreliable
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TCP 3-way handshake sequence is
SYN SYN-ACK ACK
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TCP sequence number represents
Number of first byte in segment
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TCP acknowledgment number means
Next byte sender expects
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Maximum TCP window size in window field is
65535 bytes
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Minimum TCP header size is
20 bytes
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Maximum TCP header size is
60 bytes
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PSH flag in TCP means
Push data immediately to application
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FIN flag in TCP means
No more data from this sender
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RST flag in TCP means
Reset - immediately abort connection
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URG flag in TCP marks segment as
Containing urgent data
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UDP header size is
8 bytes
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