Exam Code: cisco 100 105 (Practice Exam Latest Test Questions VCE PDF)
Exam Name: Cisco Interconnecting Cisco Networking Devices Part 1 (ICND1 v3.0)
Certification Provider: Cisco
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Q121. - (Topic 3) 

What is the subnet address of 172.16.159.159/22? 

A. 172.16.0.0 

B. 172.16.128.0 

C. 172.16.156.0 

D. 172.16.159.0 

E. 172.16.159.128 

F. 172.16.192.0 

Answer:

Explanation: 

Converting to binary format it comes to 11111111.11111111.11111100.00000000 or 

255.255.252.0 Starting with 172.16.0.0 and having increment of 4 we get. 


Q122. - (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:

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. 


Q123. - (Topic 3) 

What is the subnet address for the IP address 172.19.20.23/28? 

A. 172.19.20.0 

B. 172.19.20.15 

C. 172.19.20.16 

D. 172.19.20.20 

E. 172.19.20.32 

Answer:

Explanation: 

From the /28 we can get the following: 

Increment: 16 (/28 = 11111111.11111111.11111111.11110000) 

Network address: 172.19.20.16 (because 16 < 23) 

Broadcast address: 172.16.20.31 (because 31 = 16 + 16 – 1) 


Q124. - (Topic 2) 

Which address type does a switch use to make selective forwarding decisions? 

A. Source IP address 

B. Destination IP address 

C. Source and destination IP address 

D. Source MAC address 

E. Destination MAC address 

Answer:

Explanation: 

Switches analyze the destination MAC to make its forwarding decision since it is a layer 2 device. Routers use the destination IP address to make forwarding decisions. 


Q125. - (Topic 3) 

An administrator is working with the 192.168.4.0 network, which has been subnetted with a /26 mask. Which two addresses can be assigned to hosts within the same subnet? (Choose two.) 

A. 192.168.4.61 

B. 192.168.4.63 

C. 192.168.4.67 

D. 192.168.4.125 

E. 192.168.4.128 

F. 192.168.4.132 

Answer: C,D 

Explanation: 

Increment: 64 (/26 = 11111111.11111111.11111111.11000000) 

The IP 192.168.4.0 belongs to class C. The default subnet mask of class C is /24 and it has 

been subnetted with a /26 mask so we have 2(26-24).= 22.= 4 sub-networks: 

1st subnet: 192.168.4.0 (to 192.168.4.63) 

2nd subnet: 192.168.4.64 (to 192.168.4.127) 

3rd subnet: 192.168.4.128 (to 192.168.4.191) 

4th subnet: 192.168.4.192 (to 192.168.4.225) 

In all the answers above, only answer C and D are in the same subnet. 

Therefore only IPs in this range can be assigned to hosts. 


Q126. - (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. 


Q127. - (Topic 7) 

When a router makes a routing decision for a packet that is received from one network and destined to another, which portion of the packet does if replace? 

A. Layer 2 frame header and trailer 

B. Layer 3 IP address 

C. Layer 5 session 

D. Layer 4 protocol 

Answer:

Explanation: 

Router Switching Function (1.2.1.1)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. NOTE In this context, the term “switching” literally means moving packets from source to destination and should not be confused with the function of a Layer 2 switch. After the router has determined the exit interface using the path determination function, the router must encapsulate the packet into the data link frame of the outgoing interface. What does a router do with a packet received from one network and destined for another network? The router performs the following three major steps: 

. Step 1. De-encapsulates the Layer 3 packet by removing the Layer 2 frame header and trailer. . Step 2. Examines the destination IP address of the IP packet to find the best path in the routing table. . Step 3. If the router finds a path to the destination, it encapsulates the Layer 3 packet into a new Layer 2 frame and forwards the frame out the exit interface. 


Q128. - (Topic 1) 

Which two characteristics describe the access layer of the hierarchical network design model? (Choose two.) 

A. layer 3 support 

B. port security 

C. redundant components 

D. VLANs 

E. PoE 

Answer: B,D 

Explanation: 

Access layer The main purpose of the access layer is to provide direct connection to devices on the network and controlling which devices are allowed to communicate over it. The access layer interfaces with end devices, such as PCs, printers, and IP phones, to provide access to the rest of the network. The access layer can include routers, switches, bridges, hubs, and wireless access points (AP). 

Switch features in the Access layer: 

...... 

Port security 

VLANs 

Fast Ethernet/Gigabit Ethernet 

Power over Ethernet (PoE) 

Link aggregation 

Quality of Service (QoS) 

References: http://www.ciscopath.com/content/61/ http://www.mcmcse.com/cisco/guides/hierarchical_model.shtml 

Topic 2, LAN Switching Technologies 


Q129. - (Topic 3) 

Refer to the exhibit. 

The two routers have had their startup configurations cleared and have been restarted. At a minimum, what must the administrator do to enable CDP to exchange information between R1 and R2? 

A. Configure the router with the cdp enable command. 

B. Enter no shutdown commands on the R1 and R2 fa0/1 interfaces. 

C. Configure IP addressing and no shutdown commands on both the R1 and R2 fa0/1 interfaces. 

D. Configure IP addressing and no shutdown commands on either of the R1 or R2 fa0/1 interfaces. 

Answer:

Explanation: 

If the no shut down commands are not entered, then CDP can exchange information between the two routers. By default, all Cisco device interfaces and ports are shut down and need to be manually enabled. 


Q130. - (Topic 3) 

Scenario 

Refer to the topology. Your company has decided to connect the main office with three other remote branch offices using point-to-point serial links. 

You are required to troubleshoot and resolve OSPF neighbor adjacency issues between the main office and the routers located in the remote branch offices. 

An OSPF neighbor adjacency is not formed between R3 in the main office and R6 in the Branch3 office. What is causing the problem? 

A. There is an area ID mismatch. 

B. There is a PPP authentication issue; the username is not configured on R3 and R6. 

C. There is an OSPF hello and dead interval mismatch. 

D. The R3 router ID is configured on R6. 

Answer:

Explanation: 

Using the show running-config command we see that R6 has been incorrectly configured with the same router ID as R3 under the router OSPF process.