OSI/TCP-IP Layering, Physical Layer and Switching: GATE CS previous year questions (Computer Networks)

GATE CS 2026 Set 2MCQ1 markEasy (estimate)
GATE CS 2026 Set 2, Q.21
Consider a file of size 4 million bytes being transferred between two hosts connected via a path consisting of three consecutive links of bandwidth 2 Mbps, 500 kbps, and 1 Mbps,...
OSI/TCP-IP Layering, Physical Layer and Switching
GATE CS 2025 Set 1MCQ1 markEasy (estimate)
GATE CS 2025 Set 1, Q.16
Identify the ONE CORRECT matching between the OSI layers and their corresponding functionalities as shown. OSI Layers Functionalities (a) Network layer (I) Packet routing (b) Tr...
OSI/TCP-IP Layering, Physical Layer and Switching
GATE CS 2024 Set 1MCQ2 marksEasy (estimate)
GATE CS 2024 Set 1, Q.36
Consider a network path P-Q-R between nodes P and R via router Q. Node P sends a file of size $1 0^{6}$ bytes to R via this path by splitting the file into chunks of $1 0^{3}$ bytes e...
OSI/TCP-IP Layering, Physical Layer and Switching
GATE CS 2024 Set 2MSQ1 markEasy (estimate)
GATE CS 2024 Set 2, Q.23
Node X has a TCP connection open to node Y. The packets from X to Y go through an intermediate IP router R. Ethernet switch S is the first switch on the network path between X a...
IPv4/IPv6 Addressing, Subnetting, CIDR, ARP, ICMP and NAT · OSI/TCP-IP Layering, Physical Layer and Switching
GATE CS 2022NAT2 marksEasy (estimate)
GATE CS 2022, Q.59
Consider a 100 Mbps link between an earth station (sender) and a satellite (receiver) at an altitude of 2100 km. The signal propagates at a speed of $3 \times 1 0^{8} m/s$ ....
OSI/TCP-IP Layering, Physical Layer and Switching
GATE CS 2019NAT2 marksMedium (estimate)
GATE CS 2019, Q.59 (CS Q.49)
Consider that 15 machines need to be connected in a LAN using 8-port Ethernet switches. Assume that these switches do not have any separate uplink ports. The minimum number of s...
Medium Access Control (ALOHA, CSMA/CD) and Ethernet/Switching · OSI/TCP-IP Layering, Physical Layer and Switching
GATE CS 2018MCQ1 markEasy (estimate)
GATE CS 2018, Q.23 (CS Q.13)
Match the following: Field Length in bits P. UDP Header’s Port Number I. 48 Q. Ethernet MAC Address II. 8 R. IPv6 Next Header III. 32 S. TCP Header’s Sequence Number IV. 16
OSI/TCP-IP Layering, Physical Layer and Switching
GATE CS 2018NAT1 markEasy (estimate)
GATE CS 2018, Q.35 (CS Q.25)
Consider a long-lived TCP session with an end-to-end bandwidth of 1 Gbps (= $1 0^{9}$ bits-per-second). The session starts with a sequence number of 1234. The minimum time (in seco...
OSI/TCP-IP Layering, Physical Layer and Switching
GATE CS 2018NAT2 marksMedium (estimate)
GATE CS 2018, Q.65 (CS Q.55)
Consider a simple communication system where multiple nodes are connected by a shared broadcast medium (like Ethernet or wireless). The nodes in the system use the following car...
OSI/TCP-IP Layering, Physical Layer and Switching
GATE CS 2017 Set 2MCQ2 marksEasy (estimate)
GATE CS 2017 Set 2, Q.35 (CS Q.35)
Consider two hosts $X$ and $Y$ , connected by a single direct link of rate $1 0^{6}$ bits/sec. The distance between the two hosts is $10, 000$ km and the propagation speed along the...
OSI/TCP-IP Layering, Physical Layer and Switching
GATE CS 2015 Set 3NAT2 marksHard (estimate)
GATE CS 2015 Set 3, Q.46 (CS Q.36)
Two hosts are connected via a packet switch with $1 0^{7}$ bits per second links. Each link has a propagation delay of 20 microseconds. The switch begins forwarding a packet 35 mic...
OSI/TCP-IP Layering, Physical Layer and Switching
GATE CS 2014 Set 2MCQ2 marksMedium (estimate)
GATE CS 2014 Set 2, Q.37 (CS Q.27)
An IP machine Q has a path to another IP machine H via three IP routers R1, R2, and R3. $Q - R1 - R2 - R3 - H$ H acts as an HTTP server, and Q conne...
OSI/TCP-IP Layering, Physical Layer and Switching
GATE CS 2014 Set 3MCQ1 markEasy (estimate)
GATE CS 2014 Set 3, Q.33 (CS Q.23)
In the following pairs of OSI protocol layer/sub-layer and its functionality, the INCORRECT pair is
OSI/TCP-IP Layering, Physical Layer and Switching
GATE CS 2013MCQ1 markMedium (estimate)
GATE CS 2013, Q.14 (CS Q.14)
Assume that source S and destination D are connected through two intermediate routers labeled R. Determine how many times each packet has to visit the network layer and the data...
OSI/TCP-IP Layering, Physical Layer and Switching
GATE CS 2012MCQ1 markEasy (estimate)
GATE CS 2012, Q.10 (CS Q.10)
The protocol data unit (PDU) for the application layer in the Internet stack is
OSI/TCP-IP Layering, Physical Layer and Switching
GATE CS 2012MCQ2 marksMedium (estimate)
GATE CS 2012, Q.44 (CS Q.44)
Consider a source computer ( $S$ ) transmitting a file of size $1 0^{6}$ bits to a destination computer ( $D$ ) over a network of two routers ( $R_{1}$ and $R_{2}$ ) and three links ( $L_{1}$ ,...
OSI/TCP-IP Layering, Physical Layer and Switching

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