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WorksheetsICMP and Networking Concepts Quiz
Total questions: 20
Worksheet time: 10mins
ICMP operates at which OSI layer?
Transport Layer
Network Layer
Data Link Layer
Application Layer
Which ICMP message is used by the Traceroute utility?
Destination Unreachable
Echo Request
Time Exceeded
Source Quench
Why is ICMP considered an error-reporting protocol but not error-correcting?
It can only detect corrupted frames
It only informs about problems but does not resolve them
It modifies corrupted packets automatically
It retries packet transmission
At the Data Link layer, the PDU is called:
Frame
Packet
Segment
Cell
Which of the following PDUs are correctly matched?
Transport - Frame
Network - Packet
Application - Segment
Physical - Packet
If an application sends a 2 MB file, how many PDUs are generated across different OSI layers?
Only one PDU across all layers
Each layer encapsulates the higher layer's PDU into its own
Only Network layer produces PDUs
PDUs are generated only at Transport and Network layers
Which tool is most commonly used by students for visualizing packet flow in LAN/WAN topologies?
Wireshark
Cisco Packet Tracer
NS-3
MATLAB
Which ICMP message indicates that the destination host is unreachable?
Echo Request
Destination Unreachable
Source Quench
Redirect
The ICMP "Redirect" message is used to:
Drop corrupted packets
Inform a host of a better route to a destination
Terminate TCP connection
Reassign MAC address mapping
Why was the ICMP Source Quench message deprecated?
It was unreliable in UDP
It increased congestion instead of reducing it
It was incompatible with IPv6
It could not be transmitted through routers
ARP is used to find:
IP address from domain name
MAC address from IP address
Port number from IP address
IP address from MAC address
What happens if two hosts simultaneously send ARP requests for the same IP address?
Both will update ARP cache correctly
Only one host will succeed
It leads to an ARP storm and cache inconsistency
ARP will auto-resolve using TCP retransmission
A switch table maps:
IP addresses to ports
MAC addresses to switch ports
Domain names to IP addresses
Protocols to applications
How does a switch learn MAC addresses?
From ARP packets only
By manually configuring MAC-port mapping
By examining the source MAC address of incoming frames
From the routing protocol updates
If a frame arrives at a switch with a destination MAC not present in the switch table, what does the switch do?
Drops the frame
Forwards the frame to all ports (flooding)
Sends it to the default gateway
Requests ARP resolution
Which of the following correctly pairs protocol and its role?
ARP - Resolves MAC to IP
ICMP - Error reporting and diagnostics
Switch Table - Maps IP addresses to ports
PDU - Only exists at Transport layer
In a network simulation, a packet is dropped due to TTL expiry. Which of the following sequence of protocols/features is involved?
PDU → ARP → Switch Table
ICMP (Time Exceeded) → Router → Simulation Tool
TCP → DHCP → Router
ARP → ICMP → Frame
IPV6 address size
64 bit
128 bit
32 bit
256 bit
2001:0fb0::0001 is an example for
IPV6
IPV4
Subnet
mask
192.168 is an example for
public network
private network
public/private
None
