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 : 28-2 = 256 - 2 = 254

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11 13165
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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5 11704
Q:

What is the subnet for host ID 10.16.3.65/23?

Answer

A/23 is 255.255.254.0. The third octet is a block size of 2.0, 2, 4. The subnet is in the 16.2.0 subnet; the broadcast address is 16.3.255

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14 9030
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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2 8115
Q:

What must happen if a DHCP IP conflict occurs?

A) Proxy ARP will fix the issue B) The client uses a gratuitous ARP to fix the issue
C) The administrator must fix the conflict by hand at the DHCP server D) The DHCP server will reassign new IP addresses to both computers
 
Answer & Explanation Answer: C) The administrator must fix the conflict by hand at the DHCP server

Explanation:

If a DHCP Conflict is detected, either by the server sending a ping and getting response or by a host using a gratuitous ARP (arp'ing for its own IP address and seeing if a host responds), then the server will hold that address and not use it again until it is fixed by an administrator.

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4 7244
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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3 6112
Q:

What is the purpose of flow control?

A) To ensure that data is retransmitted if an acknowledgment is not received B) To reassemble segments in the correct order at the destination device
C) To provide a means for the receiver to govern the amount of data sent by the sender D) To regulate the size of each segment
 
Answer & Explanation Answer: C) To provide a means for the receiver to govern the amount of data sent by the sender

Explanation:

Flow control allows the receiving device to control  the transmitter so the receiving device's buffer does not overflow.

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0 5702
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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1 5217