Exam Code: 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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2017 Mar 100-105 sample question

Q41. - (Topic 2) 

Refer to the exhibit. 

What two things can the technician determine by successfully pinging from this computer to the IP address 172.16.236.1? (Choose two) 

A. The network card on the computer is functioning correctly. 

B. The default static route on the gateway router is correctly configured. 

C. The correct default gateway IP address is configured on the computer. 

D. The device with the IP address 172.16.236.1 is reachable over the network. 

E. The default gateway at 172.16.236.1 is able to forward packets to the internet. 

Answer: A,D 

Explanation: 

The source and destination addresses are on the same network therefore, a default gateway is not necessary for communication between these two addresses. 


Q42. - (Topic 3) 

Refer to the exhibit. 

What is the simplest way to configure routing between the regional office network 10.89.0.0/20 and the corporate network? 

A. router1(config)#ip route 10.89.0.0 255.255.240.0 10.89.16.2 

B. router2(config)#ip route 10.89.3.0 255.255.0.0 10.89.16.2 

C. router1(config)#ip route 10.89.0.0 255.255.240.0 10.89.16.1 

D. router2(config)#ip route 0.0.0.0 0.0.0.0 10.89.16.1 

Answer:

Explanation: 

The next hop of the static route should be 10.89.16.1, which is the IP address for router R1 in this example. Since this router is a stub router with only a single connection to the WAN, the simplest thing to do is to configure a single static default route back to the HQ network. 


Q43. - (Topic 5) 

Select two options which are security Issues which need to be modified before RouterA is used? (Choose two.) 

A. unencrypted weak password is configured to protect privilege mode 

B. inappropriate wording in banner message 

C. the virtual terminal lines have a weak password configured 

D. virtual terminal lines have a password, but it will not be used 

E. configuration supports un-secure web server access 

Answer: B,D 


Q44. - (Topic 3) 

What does administrative distance refer to? 

A. the cost of a link between two neighboring routers 

B. the advertised cost to reach a network 

C. the cost to reach a network that is administratively set 

D. a measure of the trustworthiness of a routing information source 

Answer:

Reference: http://www.cisco.com/en/US/tech/tk365/technologies_tech_note09186a0080094195.shtml 

Administrative distance is the feature that routers use in order to select the best path when there are two or more different routes to the same destination from two different routing protocols. Administrative distance defines the reliability of a routing protocol. Each routing protocol is prioritized in order of most to least reliable (believable) with the help of an administrative distance value. 

Administrative distance is the first criterion that a router uses to determine which routing protocol to use if two protocols provide route information for the same destination. Administrative distance is a measure of the trustworthiness of the source of the routing information. The smaller the administrative distance value, the more reliable the protocol. 


Q45. - (Topic 4) 

What does the "Inside Global" address represent in the configuration of NAT? 

A. the summarized address for all of the internal subnetted addresses 

B. the MAC address of the router used by inside hosts to connect to the Internet 

C. a globally unique, private IP address assigned to a host on the inside network 

D. a registered address that represents an inside host to an outside network 

Answer:

Explanation: 

NAT: Local and Global Definitions http://www.cisco.com/en/US/tech/tk648/tk361/technologies_tech_note09186a0080094837. shtml Cisco defines these terms as: Inside local address—The IP address assigned to a host on the inside network. This is the address configured as a parameter of the computer OS or received via dynamic address allocation protocols such as DHCP. The address is likely not a legitimate IP address assigned by the Network Information Center (NIC) or service provider. Inside global address—A legitimate IP address assigned by the NIC or service provider that represents one or more inside local IP addresses to the outside world. Outside local address—The IP address of an outside host as it appears to the inside network. Not necessarily a legitimate address, it is allocated from an address space routable on the inside. Outside global address—The IP address assigned to a host on the outside network by the host owner. The address is allocated from a globally routable address or network space. These definitions still leave a lot to be interpreted. For this example, this document redefines these terms by first defining local address and global address. Keep in mind that the terms inside and outside are NAT definitions. Interfaces on a NAT router are defined as inside or outside with the NAT configuration commands, ip nat inside destination and ip nat outside source . Networks to which these interfaces connect can then be thought of as inside networks or outside networks, respectively. Local address—A local address is any address that appears on the inside portion of the network. Global address—A global address is any address that appears on the outside portion of the network. 


Most up-to-date 100-105 answers:

Q46. - (Topic 3) 

ROUTER# show ip route 

192.168.12.0/24 is variably subnetted, 9 subnets, 3 masks C 192.168.12.64 /28 is directly connected, Loopback1 C 192.168.12.32 /28 is directly connected, Ethernet0 C 192.168.12.48 /28 is directly connected, Loopback0 O 192.168.12.236 /30 [110/128] via 192.168.12.233, 00:35:36, Serial0 C 192.168.12.232 /30 is directly connected, Serial0 O 192.168.12.245 /30 [110/782] via 192.168.12.233, 00:35:36, Serial0 O 192.168.12.240 /30 [110/128] via 192.168.12.233, 00:35:36, Serial0 O 192.168.12.253 /30 [110/782] via 192.168.12.233, 00:35:37, Serial0 O 192.168.12.249 /30 [110/782] via 192.168.12.233, 00:35:37, Serial0 O 192.168.12.240/30 [110/128] via 192.168.12.233, 00:35:36, Serial 0 

To what does the 128 refer to in the router output above? 

A. OSPF cost 

B. OSPF priority 

C. OSPF hop count 

D. OSPF ID number 

E. OSPF administrative distance 

Answer:

Explanation: 

The first parameter is the Administrative Distance of OSPF (110) while the second parameter is the cost of OSPF. 


Q47. - (Topic 1) 

Which three statements are true about the operation of a full-duplex Ethernet network? (Choose three.) 

A. There are no collisions in full-duplex mode. 

B. A dedicated switch port is required for each full-duplex node. 

C. Ethernet hub ports are preconfigured for full-duplex mode. 

D. In a full-duplex environment, the host network card must check for the availability of the network media before transmitting. 

E. The host network card and the switch port must be capable of operating in full-duplex mode. 

Answer: A,B,E 

Explanation: 

Half-duplex Ethernet is defined in the original 802.3 Ethernet and Cisco says you only use one wire pair with a digital signal running in both directions on the wire. It also uses the CSMA/CD protocol to help prevent collisions and to permit retransmitting if a collision does occur. If a hub is attached to a switch, it must operate in half-duplex mode because the end stations must be able to detect collisions. Half-duplex Ethernet—typically 10BaseT—is only about 30 to 40 percent efficient as Cisco sees it, because a large 10BaseT network will usually only give you 3- to 4Mbps—at most. Full-duplex Ethernet uses two pairs of wires, instead of one wire pair like half duplex. Also, full duplex uses a point-to-point connection between the transmitter of the transmitting device and the receiver of the receiving device, which means that with full-duplex data transfer, you get a faster data transfer compared to half duplex. And because the transmitted data is sent on a different set of wires than the received data, no collisions occur. The reason you don’t need to worry about collisions is because now Full-duplex Ethernet is like a freeway with multiple lanes instead of the single-lane road provided by half duplex. Full-duplex Ethernet is supposed to offer 100 percent efficiency in both directions; this means you can get 20Mbps with a 10Mbps Ethernet running full duplex, or 200Mbps for FastEthernet. 


Q48. - (Topic 3) 

What is the default maximum number of equal-cost paths that can be placed into the routing table of a Cisco OSPF router? 

A. 2 

B. 8 

C. 16 

D. unlimited 

Answer:

Explanation: 

Maximum-paths (OSPF) 

To control the maximum number of parallel routes that Open Shortest Path First (OSPF) 

can support, use the maximum-paths command. 

Syntax Description 

maximum 

Maximum number of parallel routes that OSPF can install in a routing table. The range is from 1 to 16 routes. 

Command Default 

8 paths 


Q49. - (Topic 3) 

Which two of these functions do routers perform on packets? (Choose two.) 

A. Examine the Layer 2 headers of inbound packets and use that information to determine the next hops for the packets 

B. Update the Layer 2 headers of outbound packets with the MAC addresses of the next hops 

C. Examine the Layer 3 headers of inbound packets and use that information to determine the next hops for the packets 

D. Examine the Layer 3 headers of inbound packets and use that information to determine the complete paths along which the packets will be routed to their ultimate destinations 

E. Update the Layer 3 headers of outbound packets so that the packets are properly directed to valid next hops 

F. Update the Layer 3 headers of outbound packets so that the packets are properly directed to their ultimate destinations 

Answer: B,C 

Explanation: 

This is the basic function of the router to receive incoming packets and then forward them to their required destination. This is done by reading layer 3 headers of inbound packets and update the info to layer 2 for further hopping. 


Q50. - (Topic 7) 

Which network topology allows all traffic to flow through a central hub? 

A. bus 

B. star 

C. mesh 

D. ring 

Answer: