Certification Questions

Q:

Which class of IP address provides a maximum of only 254 host addresses per network ID?

A) Class A B) Class B
C) Class C D) Class D
 
Answer & Explanation Answer: C) Class C

Explanation:

Class C network address has only 8 bits for defining hosts : 

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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:

 What does Mean Time to Repair (MTTR) mean?

A) Average uptime of a service B) Average downtime of a service
C) Average time between two consecutive incidents D) Average time of the breakdown-free period within a measured period
 
Answer & Explanation Answer: B) Average downtime of a service

Explanation:
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Q:

What is the best definition of an Incident Model?

A) A type of Incident involving a standard (or model) type of Configuration Item (CI) B) A set of pre-defined steps to be followed when dealing with a known type of Incident
C) The template used to define the Incident logging form used to report Incidents D) An Incident that is easy to solve
 
Answer & Explanation Answer: B) A set of pre-defined steps to be followed when dealing with a known type of Incident

Explanation:
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Q:

What command will permit SMTP mail to only host 1.1.1.1?

A) access-list 10 permit smtp host 1.1.1.1 B) access-list 110 permit ip smtp host 1.1.1.1
C) access-list 10 permit tcp any host 1.1.1.1 eq smtp D) access-list 110 permit tcp any host 1.1.1.1 eq smtp
 
Answer & Explanation Answer: D) access-list 110 permit tcp any host 1.1.1.1 eq smtp

Explanation:

when trying to find the best answer to an access - list question, always check the access - list bnumber and then the protocol. When filtering to an upper - layer protocol, you must use an extended list, numbers 100 - 199 and 2000 - 2699. Also, when you filter to the port of an upper - layer protocol, you must use either tcp or udp in the ACL protocol field. If it says ip in the protocol field, you cannot filoter on the port number of an upper - layer protocol. SMTP uses TCP

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