CISCO Certification Questions

Q:

You want to implement a mechanism that automates the IP configuration, including IP address, subnet mask, default gateway, and DNS information. Which protocol will you use to accomplish this?

A) SMTP B) SNMP
C) DHCP D) ARP
 
Answer & Explanation Answer: C) DHCP

Explanation:

Dynamic Host Configuration Protocol (DHCP) is used to provide IP information to hosts on your network. DHCP can provide a lot of information, but the most common is Ip address, subnet mask, default gateway, and DNS information.

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Q:

A router has learned three possible routes that could be used to reach a destination network. One route is from EIGRP and has a composite metric of 20684570. Another route is from OSPF with a metric of 852. The last is from RIPv2 and has a metric of 4. Which route or routes will the router install in the routing table?

A. the OSPF route
B. the EIGRP route
C. the RIPv2 route
D. all three routes
E. the OSPF and RIPv2 routes

Answer

Answer : B


Explanation :


This is one of those tricky questions just to test your knowledge of routing protocols and their administrative distance. Let’s look at the AD of popular routing protocols below:
 Routing Protocol (Source)                           AdministrativeDistance(AD)                                                             


  Directly connected                                        0


  Static Route                                                  1


  EIGRP                                                           90


  Summary Route(EIGRP)                              5


  OSPF                                                           110


  RIP                                                              120


Fom the above table, you can see that EIGRP has the lowest AD from all of the above mentioned routing protocols. So, the router will choose to use the routing protocol which has lowest Administrative Distance which in this case is B. EIGRP

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Q:

What does the command confreg 0x2142 provide?

A) It is used to restart the router B) It is used to bypass the configuration in NVRAM
C) It is used to enter ROM monitor mode D) It is used to view the lost password
 
Answer & Explanation Answer: B) It is used to bypass the configuration in NVRAM

Explanation:

The default configuration setting is 0x2102, which tells the router to load the IOS from flash and the configuration from NVRAM. 0x2142 tells the router to bypass the configuration in NVRAM so that you can perform password recovery.

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Q:

If a host on a network has the address 172.16.45.14/30, what is the subnetwork this host belongs to?

A) 172.16.45.0 B) 172.16.45.4
C) 172.16.45.8 D) 172.16.45.12
 
Answer & Explanation Answer: D) 172.16.45.12

Explanation:

A/30, regardless of the class of address, has a 252 in the fourth octet. This means we have a block size of 4 and our subnets are o,4,8,12,16, etc. Address 14 is obviously in the 12 subnet.

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Q:

What layer in the TCP/IP stack is equivalent to the Transport layer of the OSI model?

A) Application B) Host-to-Host
C) Internet D) Network Access
 
Answer & Explanation Answer: B) Host-to-Host

Explanation:

The four layers of the TCP/IP stack (also called the DoD model) are Application/process, Host-to-Host, Internet, and Network Access. The Host-to-Host layer is equivalent to the Transport layer of the OSI model.

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Q:

Acknowledgments, sequencing , and flow control are characteristics  of which OSI layer?

A) Layer 2 B) Layer 3
C) Layer 4 D) Lawer 7
 
Answer & Explanation Answer: C) Layer 4

Explanation:

A reliable Transport layer connection uses acknowledgments to make sure all data is transmitted and received reliably. A reliable connection is defined by a virtual circuit that uses acknowledgments, sequencing, and flow control, which are characteristics of the transport layer.

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Q:

If you use either Telnet or FTP, what layer are you using to generate the data?

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

Explanation:

Both FTP and Telnet use TCP at the Transport layer; however, they both are Application layer protocols, so the Application layer is the best answer for this question.

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Q:

If you want to disable STP on a port connected to a server, which command would you use?

A) disable spanning-tree B) spanning-tree off
C) spanning-tree security D) spanning-tree portfast
 
Answer & Explanation Answer: D) spanning-tree portfast

Explanation:

If you have a server or other devices connected into your switch that you're totally sure won't create a switching loop if STP is disabled, you can use something called portfast on these ports. Using it means the port won't spend the usual 50 seconds to come up while STP is converging.

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