Super to 100 105 exam

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Q71. - (Topic 3) 

Which statement about IPv6 is true? 

A. Addresses are not hierarchical and are assigned at random. 

B. Only one IPv6 address can exist on a given interface. 

C. There are 2.7 billion addresses available. 

D. Broadcasts have been eliminated and replaced with multicasts. 

Answer: D 

Explanation: 

IPv6 has three types of addresses, which can be categorized by type and scope: 

Unicast addresses. A packet is delivered to one interface. 

Multicast addresses. A packet is delivered to multiple interfaces. 

Anycast addresses. A packet is delivered to the nearest of multiple interfaces (in terms of 

routing distance). 

IPv6 does not use broadcast messages. 

Unicast and anycast addresses in IPv6 have the following scopes (for multicast addresses, 

the scope are built into the address structure): 

Link-local. The scope is the local link (nodes on the same subnet). 

Site-local. The scope is the organization (private site addressing). 

Global. The scope is global (IPv6 Internet addresses). 

In addition, IPv6 has special addresses such as the loopback address. The scope of a 

special address depends on the type of special address. 

Much of the IPv6 address space is unassigned. 

http://technet.microsoft.com/en-us/library/cc757359(v=ws.10).aspx 

Q72. - (Topic 1) 

Refer to the exhibit. 

Host A is sending a packet to Host B for the first time. What destination MAC address will Host A use in the ARP request? 

A. 192.168.0.1 

B. 172.16.0.50 

C. 00-17-94-61-18-b0 

D. 00-19-d3-2d-c3-b2 

E. ff-ff-ff-ff-ff-ff 

F. 255.255.255.255 

Answer: E Explanation: 

For the initial communication, Host A will send a broadcast ARP (all F's) to determine the correct address to use to reach the destination. ARP sends an Ethernet frame called an ARP request to every host on the shared link-layer legmen. The Ethernet header includes the source host MAC address and a destination address of all Fs representing a broadcast frame. The ARP request contains the sender's MAC and IP address and the target (destination) IP address. The target's MAC address is set to all 0s. ARP Request 

Reference: 

http://www.technicalhowto.com/protocols/arp/arp.html 

Q73. - (Topic 3) 

OSPF is configured using default classful addressing. With all routers and interfaces operational, how many networks will be in the routing table of R1 that are indicated to be learned by OSPF? 

A. 2 

B. 3 

C. 4 

D. 5 

E. 6 

F. 7 

Answer: C 

Explanation: 

Although OSPF is configured using default classful addressing but OSPF is a link-state routing protocol so it will always send the subnet mask of each network in their advertised routes. Therefore R1 will learn the the complete subnets. Four networks list below will be in the routing table of R1:+ 172.16.2.64/30+ 172.16.2.228/30+ 172.16.2.232/30+ 172.16.3.0/24 Note: Other networks will be learned as “Directly connected” networks (marked with letter “C”) 

Q74. - (Topic 3) 

Refer to the graphic. 

R1 is unable to establish an OSPF neighbor relationship with R3. What are possible reasons for this problem? (Choose two.) 

A. All of the routers need to be configured for backbone Area 1. 

B. R1 and R2 are the DR and BDR, so OSPF will not establish neighbor adjacency with R3. 

C. A static route has been configured from R1 to R3 and prevents the neighbor adjacency from being established. 

D. The hello and dead interval timers are not set to the same values on R1 and R3. 

E. EIGRP is also configured on these routers with a lower administrative distance. 

F. R1 and R3 are configured in different areas. 

Answer: D,F 

Explanation: 

This question is to examine the conditions for OSPF to create neighborhood. 

So as to make the two routers become neighbors, each router must be matched with the 

following items: 

1.

 The area ID and its types; 

2.

 Hello and failure time interval timer; 

3.

 OSPF Password (Optional); 

Q75. - (Topic 1) 

To what type of port would a cable with a DB-60 connector attach? 

A. Serial port 

B. Console port 

C. Ethernet port 

D. Fibre optic port 

Answer: A 

Explanation: 

Serial Connection 

cl_3_dte_male 

cl_2_dce 

The picture on the left shows a V.35 DTE cable with a male DB60 connector and a male standard 34-pin Winchester-type connector. The right picture shows a V.35 DCE serial cable with a male DB60 connector and a female 34-pin Winchester-type connector. As you probably guessed already, the male connector of the DTE cable is attached to the DCE cable's female connector, this is depicted in the picture below. This is known as a back-to-back connection, and 'simulates' a WAN link. In a real world setup, the DTE cable's male connector typically connects to a port on a CSU/DSU provided by a service provider (i.e. telco), which in turn connects to a CSU/DSU at another location, thru a T1 link for example. 

The DB60 connector connects to a Serial interface on a router. 

cl_4_malefemale Reference: http://www.techexams.net/techlabs/ccna/lab_hardware.shtml 

Q76. - (Topic 3) 

A network administrator is trying to add a new router into an established OSPF network. The networks attached to the new router do not appear in the routing tables of the other OSPF routers. Given the information in the partial configuration shown below, what configuration error is causing this problem? 

Router(config)# router ospf 1 

Router(config-router)# network 10.0.0.0 255.0.0.0 area 0 

A. The process id is configured improperly. 

B. The OSPF area is configured improperly. 

C. The network wildcard mask is configured improperly. 

D. The network number is configured improperly. 

E. The AS is configured improperly. 

F. The network subnet mask is configured improperly. 

Answer: C 

Explanation: 

When configuring OSPF, the mask used for the network statement is a wildcard mask similar to an access list. In this specific example, the correct syntax would have been “network 10.0.0.0 0.0.0.255 area 0.” 

Q77. - (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: B 

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. 

Q78. - (Topic 3) 

Refer to the exhibit. 

When running OSPF, what would cause router A not to form an adjacency with router B? 

A. The loopback addresses are on different subnets. 

B. The values of the dead timers on the routers are different. 

C. Route summarization is enabled on both routers. 

D. The process identifier on router A is different than the process identifier on router B. 

Answer: B 

Explanation: 

To form an adjacency (become neighbor), router A & B must have the same Hello interval, Dead interval and AREA numbers 

Q79. - (Topic 5) 

If a host experiences intermittent issues that relate to congestion within a network while remaining connected, what could cause congestion on this LAN? 

A. half-duplex operation 

B. broadcast storms 

C. network segmentation 

D. multicasting 

Answer: B 

Explanation: 

A broadcast storm can consume sufficient network resources so as to render the network unable to transport normal traffic. 

Topic 6, Simulation 

Q80. - (Topic 3) 

What is the default administrative distance of the OSPF routing protocol? 

A. 90 

B. 100 

C. 110 

D. 120 

E. 130 

F. 170 

Answer: C 

Explanation: 

Default Distance Value Table This table lists the administrative distance default values of the protocols that Cisco supports: If the administrative distance is 255, the router does not believe the source of that route and does not install the route in the routing table.