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Q:

If a hub has three computers connected to it, how many broadcast and collision domains is the hub creating?

A) Three broadcast and one collision B) Three broadcast and three collision
C) one broadcast and three collision D) One broadcast and one collision
 
Answer & Explanation Answer: D) One broadcast and one collision

Explanation:

If a hub has three computers connected to it, one broadcast and one collision domain is created

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Q:

If a switch has three computers connected to it, with no VLANs present, how many broadcast and collision domains is the switch creating?

A) Three broadcast and one collision B) Three broadcast and three collision
C) one broadcast and three collision D) One broadcast and one collision
 
Answer & Explanation Answer: C) one broadcast and three collision

Explanation:

If a switch has three computersconnected to it, with no VLANs present , one broadcast and three collision domains are created.

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Q:

When a station sends a transmission to the MAC address ff : ff : ff : ff : ff : ff, what type of transmission is it?

A) Unicast B) Multicast
C) Anycast D) Broadcast
 
Answer & Explanation Answer: D) Broadcast

Explanation:

A transmission to the MAC address ff : ff : ff : ff : ff : ff is a broadcast transmission to all stations.

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Q:

A receiving host has failed to receive all of the segments that it should acknowledge. What can the host do to improve the reliability of this communication session?

A) Send a different source port number B) Restart the virtual circuit
C) Decrease the sequence number D) Decrease the window size
 
Answer & Explanation Answer: D) Decrease the window size

Explanation:

A receiving host can control the transmitter by using flow control ( TCP uses windowing by default). By decreasing the window size, the receiving host can slow down the transmitting host so the receiving host does  not overflow its buffers.

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Q:

When data is encapsulated , which is the correct order?

A) Data, frame, packet, segment, bit B) Segment, data, packet, frame, bit
C) Data, segment, packet, frame, bit D) Data, segment, frame, packet, bit
 
Answer & Explanation Answer: C) Data, segment, packet, frame, bit

Explanation:

The encapsulation method is data, segment, packet, frame, bit.

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Q:

Which of the following devices do not operate at all levels of the OSI model?

A) Network management stations (NMSs) B) Routers
C) Web and application servers D) Network hosts
 
Answer & Explanation Answer: B) Routers

Explanation:

Routersoperate no higher than layer 3 of the OSI model.

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Q:

Which layer of the OSI model offers three different modes of communication : Simplex, half duplex, and full duplex?

A) Presentation B) Transport
C) Application D) Session
 
Answer & Explanation Answer: D) Session

Explanation:

The Session layer of the OSI model offers three different modes of communication : Simplex, half duplex, and full duplex.

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Q:

Routers operate at layer _____. LAN switches operate at layer ______. Ethernet hubs operate at layer _____. Word processing operates at layer _______.

A) 3, 3, 1, 7 B) 3, 2, 1, none
C) 3, 2, 1, 7 D) 3, 3, 2, none
 
Answer & Explanation Answer: B) 3, 2, 1, none

Explanation:

Routers operate at layer 3. LAN switches operate at layer 2. Ethernet hubs operate at layer 1. Word processing applications communicate to the Application layer interface, but do not operate at layer 7, so the answer would be none.

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