IDS and IPS are both types of network security tool. Which statement two statements are true?

A. An IDS identifies suspect packets and reports their presence to another device but does not take direct actions against the packets.

B. An IPS is typically located so that packets have to transit through it before progressing to their destination.

C. An IDS can react swiftly by blocking suspect packets.

D. An IPS uses Internet Protocol Synergies to identify and block suspect packages.

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IDS and IPS are both types of network security tool. Which statement two statements are true? Answer

A. An IDS identifies suspect packets and reports their presence to another device but does not take direct actions against the packets.

B. An IPS is typically located so that packets have to transit through it before progressing to their destination.

Which layer of the TCP/IP model equates most directly to the Application, Presentation and Session layers of the OSI model?

1.   Transport Layer.
2.   Internet Layer.
3.   High Level Protocols Layer.
4.   Application Layer.

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Which layer of the TCP/IP model equates most directly to the Application, Presentation and Session layers of the OSI model? Answer

D. Application Layer

What port number is used for SMTP?

1.   161
2.   110
3.   25
4.   22

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What port number is used for SMTP? Answer

C. 25

Which layer of the OSI model is associated with LAN switches?

1.   The Network layer.
2.   The Transport layer.
3.   The Data Link layer.
4.   The Physical layer.

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Which layer of the OSI model is associated with LAN switches? Answer

c. The Data Link layer.

What port number is used for SSL?

1.   404
2.   443
3.   161
4.   110

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What port number is used for SSL? Answer

2. 443

What port number is used for HTTP?

1.  25
2.   8
3.   80
4.   160

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What port number is used for HTTP? answer

C. 80

What is the main difference between TCP and UDP?

1.   UDP packets stream over the network and are hence more suitable for voice and video traffic, whereas TCP packets take non-contiguous routes.
2.   TCP checks that packets have arrived at their destination and resends packets which appear not to have arrived. UDP sends packet and does not attempt to check whether they have arrived at their destination or not.
3.   TCP manages flow control more efficiently.
4.   TCP is regarded as a cleaner and more efficient protocol than UDP.

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What is the main difference between TCP and UDP? Answer

TCP checks that packets have arrived at their destination and resends packets which appear not to have arrived. UDP sends packet and does not attempt to check whether they have arrived at their destination or not.

Some colleagues are discussing QoS, and are interested in jitter. What is jitter?

1.   Jitter refers to the variation in delay experienced by packets.
2.   Jitter is a clicking noise that can be heard on some VoIP calls. It is caused by loss of UDP packets.
3.   Jitter is a flickering effect sometimes seen on streaming video.
4.   Jitter is a predefined settings package that provides optimal QoS for IP telephony use.

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Some colleagues are discussing QoS, and are interested in jitter. What is jitter? Answer

Jitter refers to the variation in delay experienced by packets.

What does CSMA/CD stand for?

1.   Carrier Sense Multiple Action with Collision Detection.
2.   Carrier Sense Multiple Access with Collisionless Delivery.
3.   Carrier Sense Multiple Action with Collision Detonation.
4.   Carrier Sense Multiple Access with Collision Detection.

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What does CSMA/CD stand for? Answers

Carrier Sense Multiple Access with Collision Detection.

What is a DMZ LAN (Demilitarized Zone)?

1. An area where devices which need to be accessed from outside the network with minimal or no security can be located.

2. An area where email servers are located.

3. An area where devices which do not require a very high level of security must be located.

4. An area where all devices which do note require user authentication must be located.3

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What is a DMZ LAN (Demilitarized Zone)? Answers

An area where devices which need to be accessed from outside the network with minimal or no security can be located.

Why is TCP slower than UDP (choose two)?

1. TCP has a higher overhead, because it sends packets used for sequencing, acknowledgement and error correction.
2. UDP can be used over fibre-optic media but TCP cannot.
3. TCP is an older protocol that is inherently slow.
4. UDP does not have to wait for acknowledgments or hold data in memory until an acknowledgement arrives.
   
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Why is TCP slower than UDP (choose two)? Answer

• TCP has a higher overhead, because it sends packets used for sequencing, acknowledgement and error correction.

• UDP does not have to wait for acknowledgments or hold data in memory until an acknowledgement arrives.