Certification Questions

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:

An administrator issues the command "ping 127.0.0.1" from the command line prompt on a PC host named PC1. If an ICMP reply is received, what does this confirm?

A. The PC host PC1 has connectivity with a local host
B. The PC host PC1 has connectivity with a Layer 3 device
C. The PC host PC1 has a default gateway correctly configured
D. The PC host PC1 has connectivity up to Layer 5 of the OSI model
E. The PC host PC1 has the TCP/IP protocol stack correctly installed

Answer

Answer : E

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Subject: CCNA

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Q:

The network with ip address 192.168.100.0/27 is to be used on a router. If ip subnet-zero is configured, which statement describe the resulting number of available subnets and hosts?

A) 7 usable subnets, each with 32 host addresses B) 8 usable subnets, each with 30 host addresses
C) 8 usable subnets, each with 27 host addresses D) 7 usable subnets, each with 24 host addresses
 
Answer & Explanation Answer: B) 8 usable subnets, each with 30 host addresses

Explanation:

Because subnet zero is configured and we have a class C address (192.168.100.0) then the network portion will have 3 bits so 8 subnets will be available. The rest of the bits, 5, represent the available hosts, so 2^5=32, but only 30 are available, 0 ad 31 are network and broadcast respectively.

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Q:

Of which ITIL process are Reliability, Serviceability and Maintainability components?

A) Service Level Management B) Problem Management
C) Availability Management D) IT Service Continuity Management
 
Answer & Explanation Answer: C) Availability Management

Explanation:
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Q:

The router address 192.168.10.250 is the default gateway for both the Web Server 2 and Host 1. What is the correct subnet mask for this network?

A. 255.255.255.0
B. 255.255.255.192
C. 255.255.255.250
D. 255.255.255.252

Answer

Answer : A

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Subject: CCNA

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Q:

Decomposing tasks into smaller activities can be helpful in reducing the amount of stress associated with overwhelmingly large milestones. What is a feature of the hierarchical nature of the WBS? 

A) A WBS hierarchy prevents duplication B) A WBS cab be rolled up or collapsed to provide information at the appropriate level for a particular audience.
C) The decomposition of tasks provides a detailed planning tool D) The depth of a WBS is restricted to three levels, which avoids overplanning
 
Answer & Explanation Answer: B) A WBS cab be rolled up or collapsed to provide information at the appropriate level for a particular audience.

Explanation:

Answer A is incorrect because the WBS hierarchy does not prevent duplication by itself. Answer C is incorrect because a WBS is focused on deliverables and components or work packages and not on tasks. Answer D is incorrect because a WBS can be sized appropriately to the project size with as many levels as necessary.

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Q:

You recently been promoted to Network Administrator for DLM Shipping. When you took over this position the first thing you notice is this Windows 2000 environment using DNS naming convention, root domain is DIM.COM, with numerous child domains. User accounts are stored in the child domains. However your supervisor informs you that root domain is misspelled and should be DLM.COM. He explains this is causing tremendous problems with the users and customers. He wants you to rename the domain. What will happen if you rename this root domain server?

A) When you rename the root domain server you will only have to rebuild the user accounts since the root domain holds the authentication (SAM) database. B) When you rename the root domain server you will simply rename the child domain also.
C) When you rename the root domain server you will lose the entire network orphaning the child domains. D) When you rename the root domain server you will not need to do anything else since domain names are inherited the child domains will acquire the new domain name.
 
Answer & Explanation Answer: C) When you rename the root domain server you will lose the entire network orphaning the child domains.

Explanation:
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Q:

To enable OSPFv3, which of the following would you use?

A) Router1 (config - if) # ipv6 ospf 10 area 0.0.0.0 B) Router1 (config - if) # ipv6 router rip 1
C) Router1 (config - if) # ipv6 router eigrp 10 D) Router1 (config - if) # ospf ipv6 10 area 0
 
Answer & Explanation Answer: A) Router1 (config - if) # ipv6 ospf 10 area 0.0.0.0

Explanation:

To enable OSPFv3, you enable the protocol at the interface level as with RIPng. The command string is ipv6 ospf proces-id area area-id.

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