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Q121. DRAG DROP - (Topic 4) 

Various protocols are listed on the left. On the right are applications for the use of those protocols. Drag the protocol on the left to an associated function for that protocol on the right. (Not all options are used.) 

Answer: 


Q122. - (Topic 4) 

When configuring NAT, the Internet interface is considered to be what? 

A. local 

B. inside 

C. global 

D. outside 

Answer:

Explanation: 

The first step to deploy NAT is to define NAT inside and outside interfaces. You may find it easiest to define your internal network as inside, and the external network as outside. However, the terms internal and external are subject to arbitration as well. This figure shows an example of this. 

2a.gif 

Reference: http://www.cisco.com/c/en/us/support/docs/ip/network-address-translation-nat/13772-12.html#topic2 


Q123. - (Topic 1) 

How does a switch differ from a hub? 

A. A switch does not induce any latency into the frame transfer time. 

B. A switch tracks MAC addresses of directly-connected devices. 

C. A switch operates at a lower, more efficient layer of the OSI model. 

D. A switch decreases the number of broadcast domains. 

E. A switch decreases the number of collision domains. 

Answer:

Explanation: 

Some of the features and functions of a switch include: 

A switch is essentially a fast, multi-port bridge, which can contain dozens of ports. 

Rather than creating two collision domains, each port creates its own collision domain. 

In a network of twenty nodes, twenty collision domains exist if each node is plugged into its 

own switch port. 

If an uplink port is included, one switch creates twenty-one single-node collision domains. 

A switch dynamically builds and maintains a Content-Addressable Memory (CAM) table, 

holding all of the necessary MAC information for each port. 

For a detailed description of how switches operate, and their key differences to hubs, see 

the reference link below. 

Reference: http://www.cisco.com/warp/public/473/lan-switch-cisco.shtml 


Q124. - (Topic 5) 

Refer to the exhibit. 

The network administrator made the entries that are shown and then saved the configuration. From a console connection, what password or password sequence is required for the administrator to access privileged mode on Router1? 

A. cisco 

B. sanfran 

C. sanjose 

D. either cisco or sanfran 

E. either cisco or sanjose 

F. sanjose and sanfran 

Answer:

Explanation: 

The enable secret password takes precedence over the enable password, so sanfran will be used. 


Q125. - (Topic 3) 

R1 is configured with the default configuration of OSPF. From the following list of IP addresses configured on R1, which address will the OSPF process select as the router ID? 

A. 192.168.0.1 

B. 172.16.1.1 

C. 172.16.2.1 

D. 172.16.2.225 

Answer:

Explanation: 

The Router ID (RID) is an IP address used to identify the router and is chosen using the following sequencE. 

+

 The highest IP address assigned to a loopback (logical) interface. + If a loopback interface is not defined, the highest IP address of all active router's physical interfaces will be chosen. 

+

 The router ID can be manually assigned In this case, because a loopback interface is not configured so the highest active IP address 192.168.0.1 is chosen as the router ID. 


Q126. - (Topic 1) 

Refer to the exhibit. 

A network device needs to be installed in the place of the icon labeled Network Device to accommodate a leased line attachment to the Internet. Which network device and interface configuration meets the minimum requirements for this installation? 

A. a router with two Ethernet interfaces 

B. a switch with two Ethernet interfaces 

C. a router with one Ethernet and one serial interface 

D. a switch with one Ethernet and one serial interface 

E. a router with one Ethernet and one modem interface 

Answer:

Explanation: 

Only a router can terminate a leased line attachment access circuit, and only a router can connect two different IP networks. Here, we will need a router with two interfaces, one serial connection for the line attachment and one Ethernet interface to connect to the switch on the LAN. 


Q127. - (Topic 1) 

Refer to the exhibit. 

The exhibit is showing the topology and the MAC address table. Host A sends a data frame to host D. What will the switch do when it receives the frame from host A? 

A. The switch will add the source address and port to the MAC address table and forward the frame to host D. 

B. The switch will discard the frame and send an error message back to host A. 

C. The switch will flood the frame out of all ports except for port Fa0/3. 

D. The switch will add the destination address of the frame to the MAC address table and forward the frame to host D. 

Answer:

Explanation: 

When switch receives the data frame from the host not having the MAC address already on the MAC table, it will add the MAC address to source port on MAC address table and sends the data frame. 


Q128. - (Topic 3) 

Which router command will configure an interface with the IP address 10.10.80.1/19? 

A. router(config-if)# ip address 10.10.80.1/19 

B. router(config-if)# ip address 10.10.80.1 255.255.0.0 

C. router(config-if)# ip address 10.10.80.1 255.255.255.0 

D. router(config-if)# ip address 10.10.80.1 255.255.224.0 

E. router(config-if)# ip address 10.10.80.1 255.255.240.0 

F. router(config-if)# ip address 10.10.80.1 255.255.255.240 

Answer:

Explanation: 

255.255.224 equal /19 in CIDR format hence the answer 


Q129. - (Topic 2) 

What does a host on an Ethernet network do when it is creating a frame and it does not have the destination address? 

A. Drops the frame 

B. Sends out a Layer 3 broadcast message 

C. Sends a message to the router requesting the address 

D. Sends out an ARP request with the destination IP address 

Answer:

Explanation: 

In this case, it will send out an ARP request for MAC address of the destination IP (assuming it doesn't already have it in its table) and then address it to the destination's MAC address. 


Q130. - (Topic 1) 

Which of the following are types of flow control? (Choose three.) 

A. buffering 

B. cut-through 

C. windowing 

D. congestion avoidance 

E. load balancing 

Answer: A,C,D 

Explanation: 

During Transfer of data, a high speed computer is generating data traffic a lot faster than the network device can handle in transferring to destination, so single gateway or destination device cannot handle much amount of traffic that is called "Congestion". 

Buffering The Technie is used to control the data transfer when we have congestion, when a network device receive a data it stores in memory section and then transfer to next destination this process called "Buffering". Windowing Whereas Windowing is used for flow control by the Transport layer. Say the sender device is sending segments and the receiver device can accommodate only a fixed number of segments before it can accept more, the two devices negotiate the window size during the connection setup. This is done so that the sending device doesn't overflow the receiving device's buffer. Also the receiving device can send a single acknowledgement for the segments it has received instead of sending an acknowledgement after every segment received. Also, this window size is dynamic meaning, the devices can negotiate and change the window size in the middle of a session. So if initially the window size is three and the receiving device thinks that it can accept more number of segments in its buffer it can negotiate with the sending device and it increases it to say 5 for example. Windowing is used only by TCP since UDP doesn't use or allow flow control. 

Reference: http://www.info-it.net/cisco/ccna/exam-tips/flow-control.php