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Q111. - (Topic 7) 

Configuration of which option is required on a Cisco switch for the Cisco IP phone to work? 

A. PortFast on the interface 

B. the interface as an access port to allow the voice VLAN ID 

C. a voice VLAN ID in interface and global configuration mode 

D. Cisco Discovery Protocol in global configuration mode 

Answer:

Explanation: 

Configure the Switch Port to Carry Both Voice and Data TrafficWhen you connect an IP phone to a switch using a trunk link, it can cause high CPU utilization in the switches. As all the VLANs for a particular interface are trunked to the phone, it increases the number of STP instances the switch has to manage. This increases the CPU utilization. Trunking also causes unnecessary broadcast / multicast / unknown unicast traffic to hit the phone link. In order to avoid this, remove the trunk configuration and keep the voice and access VLAN configured along with Quality of Service (QoS). Technically, it is still a trunk, but it is called a Multi-VLAN Access Port (MVAP). Because voice and data traffic can travel through the same port, you should specify a different VLAN for each type of traffic. You can configure a switch port to forward voice and data traffic on different VLANs. Configure IP phone ports with a voice VLAN configuration. This configuration creates a pseudo trunk, but does not require you to manually prune the unnecessary VLANs. The voice VLAN feature enables access ports to carry IP voice traffic from an IP phone. The voice VLAN feature is disabled by default. The Port Fast feature is automatically enabled when voice VLAN is configured. When you disable voice VLAN, the Port Fast feature is not automatically disabled. 


Q112. - (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 


Q113. - (Topic 7) 

Which route source code represents the routing protocol with a default administrative distance of 90 in the routing table? 

A. S 

B. E 

C. D 

D. R 

E. O 

Answer:

Explanation: 

SStatic EEGP DEIGRP RRIP OOSPF 

Default Administrative distance of EIGRP protocol is 90 then answer is C 

Default Distance Value TableThis table lists the administrative distance default values of the protocols that Cisco supports: 

Route Source Default Distance Values 

Connected interface 0 Static route 1 Enhanced Interior Gateway Routing Protocol (EIGRP) summary route 5 External Border Gateway Protocol (BGP) 20 Internal EIGRP 90 IGRP 100 OSPF 110 Intermediate System-to-Intermediate System (IS-IS) 115 Routing Information Protocol (RIP) 120 Exterior Gateway Protocol (EGP) 140 On Demand Routing (ODR) 160 External EIGRP 170 Internal BGP 200 Unknown* 255 


Q114. - (Topic 3) 

OSPF routing uses the concept of areas. What are the characteristics of OSPF areas? (Choose Three.) 

A. Each OSPF area requires a loopback interface to be configured. 

B. Areas may be assigned any number from 0 to 65535. 

C. Area 0 is called the backbone area. 

D. Hierarchical OSPF networks do not require multiple areas. 

E. Multiple OSPF areas must connect to area 0. 

F. Single area OSPF networks must be configured in area 1. 

Answer: B,C,E 

Explanation: 

Definition of OSPF areas: An OSPF network may be structured, or subdivided, into routing areas to simplify administration and optimize traffic and resource utilization. Areas are identified by 32-bit numbers, expressed either simply in decimal, or often in octet-based dot-decimal notation, familiar from IPv4 address notation. 

See discussion following Cisco Learning discussion. 

https://learningnetwork.cisco.com/message/90832 


Q115. - (Topic 3) 

Which statements describe the routing protocol OSPF? (Choose three.) 

A. It supports VLSM. 

B. It is used to route between autonomous systems. 

C. It confines network instability to one area of the network. 

D. It increases routing overhead on the network. 

E. It allows extensive control of routing updates. 

F. It is simpler to configure than RIP v2. 

Answer: A,C,E 

Explanation: 

Routing overhead is the amount of information needed to describe the changes in a dynamic network topology. All routers in an OSPF area have identical copies of the topology database and the topology database of one area is hidden from the rest of the areas to reduce routing overhead because fewer routing updates are sent and smaller routing trees are computed and maintained (allow extensive control of routing updates and confine network instability to one area of the network). 


Q116. - (Topic 7) 

Which NTP command configures the local device as an NTP reference clock source? 

A. ntp peer 

B. ntp broadcast 

C. ntp master 

D. ntp server 

Answer:


Q117. - (Topic 3) 

Which of the following describe the process identifier that is used to run OSPF on a router? (Choose two) 

A. It is locally significant. 

B. It is globally significant. 

C. It is needed to identify a unique instance of an OSPF database. 

D. It is an optional parameter required only if multiple OSPF processes are running on the router. 

E. All routers in the same OSPF area must have the same process ID if they are to exchange routing information. 

Answer: A,C 

Explanation: 

https://learningnetwork.cisco.com/thread/6248 They are locally significant only, and have no bearing on the structure of any OSPF packet or LSA update. So you can have a separate process-id on every single router in your network if you so desire. 


Q118. - (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. 


Q119. - (Topic 3) 

Which statement describes the process ID that is used to run OSPF on a router? 

A. It is globally significant and is used to represent the AS number. 

B. It is locally significant and is used to identify an instance of the OSPF database. 

C. It is globally significant and is used to identify OSPF stub areas. 

D. It is locally significant and must be the same throughout an area. 

Answer:

Explanation: 

The Process ID for OSPF on a router is only locally significant and you can use the same number on each router, or each router can have a different number-it just doesn't matter. The numbers you can use are from 1 to 65,535. Don't get this confused with area numbers, which can be from 0 to 4.2 billion. 


Q120. - (Topic 7) 

Which MTU size can cause a baby giant error? 

A. 1500 

B. 9216 

C. 1600 

D. 1518 

Answer:

Explanation: http://www.cisco.com/c/en/us/support/docs/switches/catalyst-4000-series-switches/29805-175.html