5.a: Quiz Components of LAN

Question 1

(1) Which of the following devices has the capacity to store frames and act as a storage and
forward device?

A. Hub
B. Bridge
C. Repeater
D. Router

Answer 1

Answer: B. Bridge

Explanation: Bridges act as store-and-forward devices in moving frames toward their destination.
This is achieved by analyzing the MAC header of a data packet. By examining the MAC address, the bridge can make decisions to direct the packet to its destination. Bridge works like Layer 2-Switch. Both Bridge & Switch works at layer 2 (Data Link Layer) of OSI Layers.

Question 2

(2) ‘Hub’ operates at which of the following OSI layer?

A. Data Link Layer
B.Physical Layer
C. Network Layer
D.Transport Layer

Answer 2

Answer: B.Physical Layer

Explanation: CISA aspirant should be aware about layer of OSI at which below devices operate.
Hub - Physical Layer (1st Layer)
Switch – Data Link Layer (2nd Layer)
Bridge – Data Link Layer (2nd Layer)
Router – Network Layer (3rd Layer)
Gateway-Application Layer (7th Layer)

It must be noted that higher the layer, more intelligent the devices will be. Out of above Hub (layer 1) is dumbest device and Gateway (layer 7) is the most intelligent device.

Question 3

(3) ‘Layer-2 Switch’ operates at which of the following
OSI layer?

A. Data Link Layer
B.Physical Layer
C. Network Layer
D.Transport Layer

Answer 3

Answer: A. Data Link Layer

Explanation: CISA aspirant should be aware about layer of OSI at which below devices operate.
Hub - Physical Layer (1st Layer)
Switch – Data Link Layer (2nd Layer)
Bridge – Data Link Layer (2nd Layer)
Router – Network Layer (3rd Layer)
Gateway-Application Layer (7th Layer)

Question 4

(4) ‘Bridge’ operates at which of the following OSI layer?
A. Data Link Layer
B.Physical Layer
C. Network Layer
D.Transport Layer

Answer 4

Answer: A. Data Link Layer

Explanation: CISA aspirant should be aware about layer of OSI at which below devices operate.
Hub - Physical Layer (1st Layer)
Switch – Data Link Layer (2nd Layer)
Bridge – Data Link Layer (2nd Layer)
Router – Network Layer (3rd Layer)
Gateway-Application Layer (7th Layer)

Question 5

(5) ‘Router’ operates at which of the following OSI layer?
A. Data Link Layer
B.Physical Layer
C. Network Layer
D.Transport Layer

Answer 5

Answer: C. Network Layer

Explanation: CISA aspirant should be aware about layer of OSI at which below devices operate.
Hub - Physical Layer (1st Layer)
Switch – Data Link Layer (2nd Layer)
Bridge – Data Link Layer (2nd Layer)
Router – Network Layer (3rd Layer)
Gateway-Application Layer (7th Layer)

Question 6

(6)Which of the following is the most intelligent device?
A.Hub
B.Switch
C.Bridge
D.Router

Answer 6

Answer: D.Router

Explanation: It must be noted that higher the layer at which device operates, more intelligent the
devices will be. Out of above, Hub (layer 1) is dumbest device and Router (layer 3) is the most
intelligent device. By examining the IP address, the router can make intelligent decisions to direct
the packet to its destination. Router can block broadcast information, block traffic to unknown
addresses, and filter traffic based on network or host information.

Question 7

(7) By examining the IP address, which of the following device can make intelligent decisions to
direct the packet to its destination?

A.Hub
B.Layer-2 Switch
C.Bridge
D.Router

Answer 7

Answer: D.Router

Explanation: Router operates at Network Layer (i.e. 3rd Layer) of OSI Model. By examining the IP
address, the router can make intelligent decisions to direct the packet to its destination. Router can block broadcast information, block traffic to unknown addresses, and filter traffic based on network
or host information.