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2017 Mar 100-105 exam topics

Q131. - (Topic 3) 

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 20514560. Another route is from OSPF with a metric of 782. 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:

Explanation: 

When one route is advertised by more than one routing protocol, the router will choose to use the routing protocol which has lowest Administrative Distance. The Administrative Distances of popular routing protocols are listed below: 


Q132. - (Topic 3) 

Which address are OSPF hello packets addressed to on point-to-point networks? 

A. 224.0.0.5 

B. 172.16.0.1 

C. 192.168.0.5 

D. 223.0.0.1 

E. 254.255.255.255 

Answer:

Explanation: 

Why does the show ip ospf neighbor Command Reveal Neighbors in the Init State? http://www.cisco.com/en/US/tech/tk365/technologies_tech_note09186a0080093f11.shtml OSPF hello packets have a destination address of 224.0.0.5 (the all ospf routers multicast 

address). 


Q133. - (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. 


Q134. - (Topic 5) 

What is the bandwidth on the WAN interface of Router 1? 

A. 16 Kbit/sec 

B. 32 Kbit/sec 

C. 64 Kbit/sec 

D. 128 Kbit/sec 

E. 512 Kbit/sec 

F. 1544 Kbit/sec 

Answer:

Explanation: 

Use the “show interface s0/0” to see the bandwidth set at 16 Kbit/sec. The show interface s0/0 command results will look something like this and the bandwidth will be represented by the "BW" on the fourth line as seen below where BW equals 1544 Kbits/sec. R2#show interface serial 0/0 Serial0/0 is up, line protocol is down Hardware is GT96K Serial Internet address is 10.1.1.5/30 MTU 1500 bytes, BW 1544 Kbit/sec, DLY 20000 uses. 


Q135. DRAG DROP - (Topic 1) 

On the left are various network protocols. On the right are the layers of the TCP/IP model. Assuming a reliable connection is required, move the protocols on the left to the TCP/IP layers on the right to show the proper encapsulation for an email message sent by a host on a LAN. (Not all options are used.) 

Answer: 


Up to date 100-105 exam price:

Q136. - (Topic 4) 

The network administrator is using a Windows PC application that is called putty.exe for remote communication to a switch for network troubleshooting. Which two protocols could be used during this communication? (Choose two.) 

A. SNMP 

B. HTTP 

C. Telnet 

D. RMON 

E. SSH 

Answer: C,E 

Explanation: 

PuTTY is a free implementation of Telnet and SSH for Windows and Unix platforms, and is used to connect to Cisco and other networking devices using SSH or Telnet. 

Topic 5, Infrastructure Maintenance 


Q137. - (Topic 1) 

Which statements are true regarding ICMP packets? (Choose two.) 

A. They acknowledge receipt of TCP segments. 

B. They guarantee datagram delivery. 

C. TRACERT uses ICMP packets. 

D. They are encapsulated within IP datagrams. 

E. They are encapsulated within UDP datagrams. 

Answer: C,D 

Explanation: 

Ping may be used to find out whether the local machines are connected to the network or whether a remote site is reachable. This tool is a common network tool for determining the network connectivity, which uses ICMP protocol instead of TCP/IP and UDP/IP. This protocol is usually associated with the network management tools, which provide network information to network administrators, such as ping and traceroute (the later also uses the UDP/IP protocol). ICMP is quite different from the TCP/IP and UDP/IP protocols. No source and destination ports are included in its packets. Therefore, usual packet-filtering rules for TCP/IP and UDP/IP are not applicable. Fortunately, a special "signature" known as the packet’s Message type is included for denoting the purposes of the ICMP packet. Most commonly used message types are namely, 0, 3, 4, 5, 8, 11, and 12 which represent echo reply, destination unreachable, source quench, redirect, echo request, time exceeded, and parameter problem respectively. In the ping service, after receiving the ICMP "echo request" packet from the source location, the destination 


Q138. - (Topic 1) 

Refer to the exhibit. 

Which option describes how SwitchA will handle the frame just received? 

A. It will drop the frame. 

B. It will forward the frame out of port Fa0/3 only. 

C. It will flood the frame out all ports. 

D. It will flood the frame out of all the ports except Fa0/3. 

Answer:


Q139. - (Topic 3) 

An administrator is in the process of changing the configuration of a router. What command will allow the administrator to check the changes that have been made prior to saving the new configuration? 

A. Router# show startup-config 

B. Router# show current-config 

C. Router# show running-config 

D. Router# show memory 

E. Router# show flash 

F. Router# show processes 

Answer:

Explanation: 

This command followed by the appropriate parameter will show the running config hence the admin will be able to see what changes have been made, and then they can be saved. 


Q140. - (Topic 7) 

Which feature allows a device to use a switch port that is configured for half-duplex to access the network? 

A. CSMA/CD 

B. IGMP 

C. port security 

D. split horizon 

Answer:

Explanation: 

Ethernet began as a local area network technology that provided a half-duplex shared channel for stations connected to coaxial cable segments linked with signal repeaters. In this appendix, we take a detailed look at the half-duplex shared-channel mode of operation, and at the CSMA/CD mechanism that makes it work. In the original half-duplex mode, the CSMA/CD protocol allows a set of stations to compete for access to a shared Ethernet channel in a fair and equitable manner. The protocol’s rules determine the behavior of Ethernet stations, including when they are allowed to transmit a frame onto a shared Ethernet channel, and what to do when a collision occurs. Today, virtually all devices are connected to Ethernet switch ports over full-duplex media, such as twisted-pair cables. On this type of connection, assuming that both devices can support the full-duplex mode of operation and that Auto-Negotiation (AN) is enabled, the AN protocol will automatically select the highest-performance mode of operation supported by the devices at each end of the link. That will result in full-duplex mode for the vast majority of Ethernet connections with modern interfaces that support full duplex and AN.