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2017 Mar 100-105 exams

Q31. - (Topic 3) 

Some routers have been configured with default routes. What are some of the advantages 

of using default routes? (Choose two) 

A. They establish routes that will never go down. 

B. They keep routing tables small. 

C. They require a great deal of CPU power. 

D. They allow connectivity to remote networks that are not in the routing table 

E. They direct traffic from the internet into corporate networks. 

Answer: B,D 

Explanation: 

Cisco administration 101: What you need to know about default routes Reference: 

http://www.techrepublic.com/article/cisco-administration-101-what-you-need-to-know-about-default-routes/ 


Q32. - (Topic 3) 

Which statements are TRUE regarding Internet Protocol version 6 (IPv6) addresses? (Choose three.) 

A. An IPv6 address is divided into eight 16-bit groups. 

B. A double colon (::) can only be used once in a single IPv6 address. 

C. IPv6 addresses are 196 bits in length. 

D. Leading zeros cannot be omitted in an IPv6 address. 

E. Groups with a value of 0 can be represented with a single 0 in IPv6 address. 

Answer: A,B,E 

Explanation: 

IPv6 addresses are divided into eight 16-bit groups, a double colon (::) can only be used 

once in an IPv6 address, and groups with a value of 0 can be represented with a single 0 in 

an IPv6 address. 

The following statements are also true regarding IPv6 address: 

IPv6 addresses are 128 bits in length. 

Eight 16-bit groups are divided by a colon (:). 

Multiple groups of 16-bit 0s can be represented with double colon (::). 

Double colons (::) represent only 0s. 

Leading zeros can be omitted in an IPv6 address. 

The option stating that IPv6 addresses are 196 bits in length is incorrect. IPv6 addresses 

are 128 bits in length. 

The option stating that leading zeros cannot be omitted in an IPv6 address is incorrect. 

Leading zeros can be omitted in an IPv6 address. 


Q33. - (Topic 1) 

What must occur before a workstation can exchange HTTP packets with a web server? 

A. A UDP connection must be established between the workstation and its default gateway. 

B. A UDP connection must be established between the workstation and the web server. 

C. A TCP connection must be established between the workstation and its default gateway. 

D. A TCP connection must be established between the workstation and the web server. 

E. An ICMP connection must be established between the workstation and its default gateway. 

F. An ICMP connection must be established between the workstation and the web server. 

Answer:

Explanation: 

HTTP uses TCP port 80, and a TCP port 80 connection must be established for HTTP communication to occur. http://pentestlab.wordpress.com/2012/03/05/common-tcpip-ports/ 


Q34. - (Topic 5) 

What is the subnet broadcast address of the LAN connected to Router1? 

A. 192.168.8.15 

B. 192.168.8.31 

C. 192.168.8.63 

D. 192.168.8.127 

Answer:

Explanation: 

The IP address assigned to FA0/1 is 192.168.8.9/29, making 192.168.8.15 the broadcast address. 


Q35. - (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. 


Leading 100-105 real exam:

Q36. - (Topic 5) 

Refer to the exhibit. 

A network administrator is troubleshooting a connectivity problem on the serial interfaces. The output from the show interfaces command on both routers shows that the serial interface is up, line protocol is down. Given the partial output for the show running-config in the exhibit, what is the most likely cause of this problem? 

A. The serial cable is bad. 

B. The MTU is incorrectly configured. 

C. The Layer 2 framing is misconfigured. 

D. The IP addresses are not in the same subnet. 

Answer:

Explanation: 

Here we see that Rtr3 is configured to use PPP encapsulation, but Rtr1 has not been configured for any kind of encapsulation. The default on Cisco router serial interfaces is HDLC, not PPP, so there is an encapsulation mismatch. 


Q37. - (Topic 2) 

Refer to the exhibit. 

All devices attached to the network are shown. How many collision domains are present in this network? 

A. 2 

B. 3 

C. 6 

D. 9 

E. 15 

Answer:

Explanation: 

A switch uses a separate collision domain for each port so there are a total of 9 for each device shown. In addition to this, the switch to switch connections (3) are a separate collision domain. Finally, we add the switch to router connections (2) and the router to router connection (1) for a total of 15. 


Q38. - (Topic 3) 

What two things does a router do when it forwards a packet? (Choose two.) 

A. switches the packet to the appropriate outgoing interfaces 

B. computes the destination host address 

C. determines the next hop on the path 

D. updates the destination IP address 

E. forwards ARP requests 

Answer: A,C 

Explanation: 

A primary function of a router is to forward packets toward their destination. This is accomplished by using a switching function, which is the process used by a router to accept a packet on one interface and forward it out of another interface. A key responsibility of the switching function is to encapsulate packets in the appropriate data link frame type for the outgoing data link and determining the next hop device to send the frame to. 


Q39. - (Topic 3) 

Given a Class C IP address subnetted with a /30 subnet mask, how many valid host IP addresses are available on each of the subnets? 

A. 1 

B. 2 

C. 4 

D. 8 

E. 252 

F. 254 

Answer:

Explanation: 

/30 CIDR corresponds to mask 55.255.255.252 whose binary is 11111100 which means 6 subnet bits and 2 host bits which means 62 subnets and 2 hosts per subnet. 


Q40. - (Topic 7) 

Which entity assigns IPv6 addresses to end users? 

A. ICANN 

B. APNIC 

C. RIR 

D. ISPs 

Answer: