Secrets to ccent ccna icnd1 100 105 pdf

Examcollection offers free demo for icnd1 100 105 exam. “Cisco Interconnecting Cisco Networking Devices Part 1 (ICND1 v3.0)”, also known as 100 105 icnd1 pdf exam, is a Cisco Certification. This set of posts, Passing the Cisco ccna 100 105 pdf exam, will help you answer those questions. The ccent ccna icnd1 100 105 Questions & Answers covers all the knowledge points of the real exam. 100% real Cisco ccent ccna icnd1 100 105 official cert guide exams and revised by experts!

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Q131. – (Topic 3) 

After the network has converged, what type of messaging, if any, occurs between R3 and R4? 

A. No messages are exchanged 

B. Hellos are sent every 10 seconds. 

C. The full database from each router is sent every 30 seconds. 

D. The routing table from each router is sent every 60 seconds. 

Answer:

Explanation: 

HELLO messages are used to maintain adjacent neighbors so even when the network is converged, hellos are still exchanged. On broadcast and point-to-point links, the default is 10 seconds, on NBMA the default is 30 seconds. Although OSPF is a link-state protocol the full database from each router is sent every 30 minutes (not seconds) therefore, C and D are not correct. 

Q132. – (Topic 7) 

What is the default lease time for a DHCP binding? 

A. 24 hours 

B. 12 hours 

C. 48 hours 

D. 36 hours 

Answer:

Explanation: By default, each IP address assigned by a DHCP Server comes with a one-day lease, which is the amount of time that the address is valid. To change the lease value for an IP address, use the following command in DHCP pool configuration mode: 

Q133. – (Topic 5) 

The hosts in the LAN are not able to connect to the Internet. Which commands will correct this issue? 

A. Option A 

B. Option B 

C. Option C 

D. Option D 

E. Option E 

Answer:

Explanation: 

Do a “show ip int brief” and you will see that Fa0/1 has an IP address assigned, but it is shut down. 

Q134. – (Topic 1) 

How does TCP differ from UDP? (Choose two.) 

A. TCP provides best effort delivery. 

B. TCP provides synchronized communication. 

C. TCP segments are essentially datagrams. 

D. TCP provides sequence numbering of packets. 

E. TCP uses broadcast delivery. 

Answer: B,D 

Explanation: 

Because TCP is a connection-oriented protocol responsible for ensuring the transfer of a datagram from the source to destination machine (end-to-end communications), TCP must receive communications messages from the destination machine to acknowledge receipt of the datagram. The term virtual circuit is usually used to refer to the handshaking that goes on between the two end machines, most of which are simple acknowledgment messages (either confirmation of receipt or a failure code) and datagram sequence numbers. Rather than impose a state within the network to support the connection, TCP uses synchronized state between the two endpoints. This synchronized state is set up as part of an initial connection process, so TCP can be regarded as a connection-oriented protocol. Much of the protocol design is intended to ensure that each local state transition is communicated to, and acknowledged by, the remote party. 

Reference: http://en.wikibooks.org/wiki/Communication_Networks/TCP_and_UDP_Protocols 

Q135. – (Topic 3) 

Refer to the exhibit. 

Assume that all router interfaces are operational and correctly configured. In addition, assume that OSPF has been correctly configured on router R2. How will the default route configured on R1 affect the operation of R2? 

A. Any packet destined for a network that is not directly connected to router R2 will be dropped immediately. 

B. Any packet destined for a network that is not referenced in the routing table of router R2 will be directed to R1. R1 will then send that packet back to R2 and a routing loop will occur. 

C. Any packet destined for a network that is not directly connected to router R1 will be dropped. 

D. The networks directly connected to router R2 will not be able to communicate with the 172.16.100.0, 172.16.100.128, and 172.16.100.64 subnetworks. 

E. Any packet destined for a network that is not directly connected to router R2 will be dropped immediately because of the lack of a gateway on R1. 

Answer:

Explanation: 

First, notice that the more-specific routes will always be favored over less-specific routes regardless of the administrative distance set for a protocol. In this case, because we use OSPF for three networks (172.16.100.0 0.0.0.3, 172.16.100.64 0.0.0.63, 172.16.100.128 0.0.0.31) so the packets destined for these networks will not be affected by the default route. The default route configured on R1 “ip route 0.0.0.0 0.0.0.0 serial0/0 will send any packet whose destination network is not referenced in the routing table of router R1 to R2, it doesn’t drop anything. These routes are declared in R1 and the question says that “OSPF has been correctly configured on router R2, so network directly connected to router R2 can communicate with those three subnetworks. As said above, the default route configured on R1 will send any packet destined for a network that is not referenced in its routing table to R2; R2 in turn sends it to R1 because it is the only way and a routing loop will occur. 

Q136. – (Topic 2) 

Refer to the exhibit. 

The ports that are shown are the only active ports on the switch. The MAC address table is shown in its entirety. The Ethernet frame that is shown arrives at the switch. 

What two operations will the switch perform when it receives this frame? (Choose two.) 

A. The MAC address of 0000.00aa.aaaa will be added to the MAC address table. 

B. The MAC address of 0000.00dd.dddd will be added to the MAC address table. 

C. The frame will be forwarded out of port fa0/3 only. 

D. The frame will be forwarded out of fa0/1, fa0/2, and fa0/3. 

E. The frame will be forwarded out of all the active ports. 

Answer: A,D 

Explanation: 

If the switch already has the MAC address in its table for the destination, it will forward the frame directly to the destination port. If it was not already in its MAC table, then they frame would have been flooded out all ports except for the port that it came from. It will also add the MAC address of the source device to its MAC address table 

Q137. – (Topic 7) 

Which entity assigns IPv6 addresses to end users? 

A. ICANN 

B. APNIC 

C. RIR 

D. ISPs 

Answer:

Q138. – (Topic 4) 

In the configuration of NAT, what does the keyword overload signify? 

A. When bandwidth is insufficient, some hosts will not be allowed to access network translation. 

B. The pool of IP addresses has been exhausted. 

C. Multiple internal hosts will use one IP address to access external network resources. 

D. If the number of available IP addresses is exceeded, excess traffic will use the specified address pool. 

Answer:

Explanation: 

The keyword overload.used in the ip nat inside source list 1 pool ovrld overload example command allows NAT to translate multiple inside devices to the single address in the pool. The types of NAT include: Static address translation (static NAT)—Allows one-to-one mapping between local and global addresses. Dynamic address translation (dynamic NAT)—Maps unregistered IP addresses to registered IP addresses from a pool of registered IP addresses. Overloading—Maps multiple unregistered IP addresses to a single registered IP address (many to one) using different ports. This method is also known as Port Address Translation (PAT). By using overloading, thousands of users can be connected to the Internet by using only one real global IP address. 

Q139. – (Topic 2) 

Refer to the exhibit. 

The MAC address table is shown in its entirety. The Ethernet frame that is shown arrives at 

the switch. 

What two operations will the switch perform when it receives this frame? (Choose two.) 

A. The switch will not forward a frame with this destination MAC address. 

B. The MAC address of 0000.00aa.aaaa will be added to the MAC Address Table. 

C. The MAC address of ffff.ffff.ffff will be added to the MAC address table. 

D. The frame will be forwarded out of all the active switch ports except for port fa0/0. 

E. The frame will be forwarded out of fa0/0 and fa0/1 only. 

F. The frame will be forwarded out of all the ports on the switch. 

Answer: B,D 

Explanation: 

If the switch already has the MAC address in its table for the destination, it will forward the frame directly to the destination port. If it was not already in its MAC table, then they frame would have been flooded out all ports except for the port that it came from. 

Q140. – (Topic 1) 

Refer to the exhibit. 

Mary is sending an instant message to Robert. The message will be broken into a series of packets that will traverse all network devices. What addresses will populate these packets as they are forwarded from Router1 to Router2? 

A. Option A 

B. Option B 

C. Option C 

D. Option D 

E. Option E 

Answer:

Explanation: 

The Source and Destination IP address is not going to change. Host 1 IP address will stay 

as being the source IP and the Host 2 IP address will stay the destination IP address. 

Those two are not going to change. 

For the MAC address it is going to change each time it goes from one hope to another. 

(Except switches… they don't change anything) 

Frame leaving HOST 1 is going to have a source MAC of Host 1 and a destination MAC of 

Router 1. 

Router 1 is going to strip that info off and then will make the source MAC address of Router1's exiting interface, and making Router2's interface as the destination MAC address. Then the same will happen… Router2 is going to change the source/destination info to the source MAC being the Router2 interface that it is going out, and the destination will be Host2's MAC address. 

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