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Q111. - (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 


Q112. - (Topic 7) 

On which type of device is every port in the same collision domain? 

A. a router B. a Layer 2 switch 

C. a hub 

Answer:

Explanation: Collision domainA collision domain is, as the name implies, a part of a network where packet collisions can occur. A collision occurs when two devices send a packet at the same time on the shared network segment. The packets collide and both devices must send the packets again, which reduces network efficiency. Collisions are often in a hub environment, because each port on a hub is in the same collision domain. By contrast, each port on a bridge, a switch or a router is in a separate collision domain. 


Q113. - (Topic 5) 

What should be part of a comprehensive network security plan? 

A. Allow users to develop their own approach to network security. 

B. Physically secure network equipment from potential access by unauthorized individuals. 

C. Encourage users to use personal information in their passwords to minimize the likelihood of passwords being forgotten. 

D. Delay deployment of software patches and updates until their effect on end-user equipment is well known and widely reported. 

E. Minimize network overhead by deactivating automatic antivirus client updates. 

Answer:

Explanation: 

From Cisco CCENT Exam Essentials study guide by Todd Lammle: 

Know what the first part of a comprehensive network security plan is. The first part of your comprehensive network security plan is to physically secure network equipment from potential access by unauthorized individuals. 

List the recommended ways of protecting network devices from outside network security threats. Use a firewall to restrict access from the outside to the network devices, and use SSH or another encrypted and authenticated transport to access device configurations. 

Reference: 

CCENT Cisco Certified Entry Networking Technician Study Guide: (ICND1 Exam 640-822), 2nd Edition 

by Todd Lammle 

Published by Sybex, 2013 


Q114. - (Topic 1) 

Refer to the exhibit. 

HostX is transferring a file to the FTP server. Point A represents the frame as it goes toward the Toronto router. What will the Layer 2 destination address be at this point? 

A. abcd.1123.0045 

B. 192.168.7.17 

C. aabb.5555.2222 

D. 192.168.1.1 

E. abcd.2246.0035 

Answer:

Explanation: 

For packets destined to a host on another IP network, the destination MAC address will be the LAN interface of the router. Since the FTP server lies on a different network, the host will know to send the frame to its default gateway, which is Toronto. 


Q115. 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: 


Q116. - (Topic 3) 

Refer to the exhibit. 

The internetwork is using subnets of the address 192.168.1.0 with a subnet mask of 

255.255.255.224. The routing protocol in use is RIP version 1. Which address could be assigned to the FastEthernet interface on RouterA? 

A. 192.168.1.31 

B. 192.168.1.64 

C. 192.168.1.127 

D. 192.168.1.190 

E. 192.168.1.192 

Answer:

Explanation: 

Subnet mask 255.255.255.224 with CIDR of /27 which results in 32 hosts per. 

192.168.1.31 is the broadcast address for sunbet '0' 

192.168.1.64 is the network address for subnet '2' 

192.168.1.127 is the broadcast address for subnet '3' 

192.168.1.192 is the network address for subnet '6' 


Q117. - (Topic 7) 

Which RFC was created to alleviate the depletion of IPv4 public addresses? 

A. RFC 4193 

B. RFC 1519 

C. RFC 1518 

D. RFC 1918 

Answer:


Q118. - (Topic 3) 

Refer to the exhibit. 

Which default gateway address should be assigned to HostA? 

A. 192.168.1.1 

B. 192.168.1.65 

C. 192.168.1.66 

D. 192.168.1.129 

E. 10.1.1.1 

F. 10.1.1.2 

Answer:

Explanation: 

The default gateway will be the IP address of the router that it connects to, not the switch. 


Q119. - (Topic 7) 

What is one requirement for interfaces to run IPv6? 

A. An IPv6 address must be configured on the interface. 

B. An IPv4 address must be configured. 

C. Stateless autoconfiguration must be enabled after enabling IPv6 on the interface. 

D. IPv6 must be enabled with the ipv6 enable command in global configuration mode. 

Answer:

Explanation: To use IPv6 on your router, you must, at a minimum, enable the protocol and assign IPv6 addresses to your interfaces. 


Q120. - (Topic 5) 

Two routers named Atlanta and Brevard are connected by their serial interfaces as shown in the exhibit, but there is no data connectivity between them. The Atlanta router is known to have a correct configuration. 

Given the partial configurations shown in the exhibit, what is the problem on the Brevard router that is causing the lack of connectivity? 

A. A loopback is not set. 

B. The IP address is incorrect. 

C. The subnet mask is incorrect. 

D. The serial line encapsulations are incompatible. 

E. The maximum transmission unit (MTU) size is too large. 

F. The bandwidth setting is incompatible with the connected interface. 

Answer:

Explanation: 

The connection between two routers must have IP addresses that belong to the same subnet, but in this case Atlanta is using 192.168.10.1/24 and the other is in 192.168.11.1/24.