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Network Layer MCQ - OSI Model

1.
Which device connects your home network to the Internet?
Switch
Router
Hub
Repeater
A router connects multiple networks, such as a home LAN and the Internet.
2.
What identifies your device uniquely on a network?
IP Address
MAC Table
Port Number
Protocol
An IP address uniquely identifies a device on a network.
3.
When you access a website hosted in another country, which networks are involved?
Same LAN
Different networks
Same switch
Local host only
Accessing remote websites requires communication between different networks.
4.
How does data find the correct path across the Internet?
Routing
Switching
Framing
Broadcasting
Routing determines the best path for data packets.
5.
What is the form of data sent over the Internet at the Network Layer?
Frame
Packet
Segment
Bit
Data is transmitted as packets at the Network Layer.
6.
Which OSI layer is responsible for routing?
Data Link Layer
Network Layer
Transport Layer
Session Layer
Interview Answer: Routing is handled by the Network Layer (Layer 3).
7.
What does a router use to make forwarding decisions?
MAC Table
Routing Table
ARP Cache
Switching Table
Interview Answer: Routers consult the routing table to forward packets.
8.
What type of address does the Network Layer use?
IP Address
MAC Address
Port Address
Physical Address
Interview Answer: The Network Layer uses logical (IP) addresses.
9.
Which device works at the Network Layer?
Hub
Switch
Router
Bridge
Interview Answer: Routers operate at OSI Layer 3.
10.
Which value helps a router choose the best path?
Subnet Mask
Metric
Gateway
Interface
Interview Answer: A metric determines the best route, usually the lowest value.
1.
Which layer of the OSI model is responsible for logical addressing?
Data Link Layer
Network Layer
Transport Layer
Physical Layer
The Network Layer handles logical addressing such as IP addresses.
2.
What is the Protocol Data Unit (PDU) of the Network Layer?
Frame
Packet
Segment
Bit
The PDU at the Network Layer is called a packet.
3.
Which device primarily operates at the Network Layer?
Hub
Switch
Router
Repeater
Routers operate at Layer 3 and forward packets between networks.
4.
What type of addressing is used at the Network Layer?
MAC address
IP address
Port number
Physical address
The Network Layer uses logical addressing such as IP addresses.
5.
What process determines the best path for data to travel?
Routing
Switching
Encapsulation
Framing
Routing selects the best path to reach a destination network.
6.
Which table is used by a router to forward packets?
MAC table
Routing table
ARP table
Switch table
Routers use routing tables to determine packet forwarding.
7.
Which routing table entry identifies the target network?
Destination network
Metric
Interface
Gateway
The destination network specifies where the packet is intended to go.
8.
Which routing table field defines the network portion of an IP?
Metric
Subnet mask
Next hop
Interface
Subnet masks determine the network and host portions of an IP address.
9.
Which routing table entry indicates the next router?
Next-hop address
Metric
Subnet mask
Destination
The next-hop address is the gateway to forward packets.
10.
Which routing table field specifies where packets exit the router?
Metric
Subnet mask
Outgoing interface
Destination
The outgoing interface shows which port the packet will leave from.
11.
Which routing table value determines the best path?
Subnet mask
Metric
Gateway
Interface
Lower metric values usually indicate better routes.
12.
What is the process of sending packets between networks called?
Packet forwarding
Framing
Switching
Encoding
Packet forwarding is handled by routers at the Network Layer.
13.
The Network Layer is also known as which OSI layer?
Layer 2
Layer 3
Layer 4
Layer 5
The Network Layer corresponds to Layer 3 of the OSI model.
14.
Which protocol works at the Network Layer?
IP
TCP
HTTP
FTP
Internet Protocol (IP) is a Network Layer protocol.
15.
What type of addressing does the Network Layer provide?
Logical addressing
Physical addressing
Port addressing
Application addressing
IP addresses are logical addresses used at the Network Layer.
16.
Which device can function as both a switch and router?
Hub
Layer 3 switch
Bridge
Repeater
Layer 3 switches perform routing and switching.
17.
The Network Layer is responsible for communication between?
Same devices
Different networks
Same LAN only
Same switch
The Network Layer enables communication across different networks.
18.
Another name for next-hop address is?
Gateway
Metric
Interface
Subnet
Gateway refers to the next-hop router address.
19.
Routers make decisions based on what?
MAC address
Routing decisions
Port numbers
Frames
Routing decisions are based on routing table entries.
20.
What does a router select before forwarding a packet?
MAC address
Frame size
Best path
Port number
Routers determine the best path using routing metrics.

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