This set of Computer Networks Multiple Choice Questions & Answers (MCQs) focuses on “Switches and Hubs”.
1. Which of the following is not concerned by the switch to manage traffic in it?
a) MAC address
b) Collision Domain
c) Segmentation
d) Number of ports
View Answer
Explanation: Number of ports don’t affect the traffic because each port will have its own collision domain to provide descent traffic. MAC address is used to send the packets to destination ports to avoid collision.
2. Which type of switch has more features among the following?
a) Unmanaged switch
b) Managed switch
c) Enterprise managed switch
d) Smart switch
View Answer
Explanation: Enterprise managed switch has advanced features like SNMP age, web interface and CLI prompt. Unlike unmanaged switches, it can modify the changes, display, restore and backup the configuration.
3. Which of the following can’t be a feature of hub?
a) Filtering the data
b) Half duplex transmission
c) No software association
d) Star topology architecture
View Answer
Explanation: Main disadvantage of the hub is, it broadcasts every message without filtering the address in it. As the hub has no intelligence, it sends packets to every port. Also, bandwidth will be wasted for the ports, which are not interested in receiving the packet.
4. Which of the following are the types present in the hubs?
a) Passive, active
b) Active, intelligent
c) Passive, Intelligent, non-intelligent
d) Passive, active, intelligent
View Answer
Explanation: Passive hubs are used in physical networks, where each device is connected to it physically. Active hubs keep an eye on packets that are being transmitted using store technology. Intelligent hubs have more features such as problem resolving, good performance.
5. Which of the following is incorrect about hubs?
a) It does not have intelligence
b) It has routing tables
c) It uses broadcast messages
d) It has no IP address
View Answer
Explanation: A switch has no intelligence, and it does not need information about the routes as it uses broadcast messages. Regardless of routes are routing tables and broadcast messages will be sent to each port.
6. What is the form of data, that is transmitted in the hub?
a) Electrical signals
b) Packets
c) Frames
d) Sign waves
View Answer
Explanation: Physical layer takes care of the electrical signal, which needs to be passed through different media. Bits are sent as electrical signal and can be converted into light pulses also.
7. Which of the following device belongs to physical layer?
a) Switch
b) Hub
c) Bridge
d) Router
View Answer
Explanation: Hub and repeater are the physical layer devices which does not concern data link layer addresses in any way to transmit the frames. A hub has multiple lines to connect devices and sends frames that arrive on one line to every line regardless of destination.
8. Which of the following device is a data link layer device?
a) Router
b) Switch
c) Hub
d) Repeater
View Answer
Explanation: Switches are also called as modern bridges and uses the frame headers to transmit the frames to the destination computer.
9. What is the maximum speed of the hub for packet broadcasting?
a) 100 MBPS
b) 10 MBPS
c) 1 MBPS
d) 250 MBPS
View Answer
Explanation: A normal hub can transmit at speed of 10 MBPS only. As the layer 2 device doesn’t, it has less transmission speed than upper layers.
10. A hub has full duplex mode of transmission.
a) True
b) False
View Answer
Explanation: A hub has half-duplex in which sender and receiver can transmit the data but not at the same time. This is because, hub has only one collision domain, so it is not possible for any two hosts to send the data at a time causing collision.
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