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Q91. – (Topic 1) 

Which layer of the OSI model controls the reliability of communications between network devices using flow control, sequencing and acknowledgments? 

A. Physical 

B. Data-link 

C. Transport 

D. Network 

Answer:

Q92. – (Topic 3) 

Refer to the output of the corporate router routing table shown in the graphic. 

The corporate router receives an IP packet with a source IP address of 192.168.214.20 and a destination address of 192.168.22.3. 

What will the router do with this packet? 

A. It will encapsulate the packet as Frame Relay and forward it out interface Serial 0/0.117. 

B. It will discard the packet and send an ICMP Destination Unreachable message out interface FastEthernet 0/0. 

C. It will forward the packet out interface Serial 0/1 and send an ICMP Echo Reply message out interface serial 0/0.102. 

D. It will change the IP packet to an ARP frame and forward it out FastEthernet 0/0. 

Answer:

Explanation: 

Since the destination network is not in the routing table, and no default gateway has been configured, the router will discard the packet and send an ICMP Destination Unreachable message out interface FastEthernet 0/0. It knows to send it out Fa 0/0 because the routing table for the source IP address of 192.168.214.20 shows it was learned from the Fa 0/0 interface. 

Q93. – (Topic 5) 

Refer to the exhibit. 

The network administrator is testing connectivity from the branch router to the newly installed application server. What is the most likely reason for the first ping having a success rate of only 60 percent? 

A. The network is likely to be congested, with the result that packets are being intermittently dropped. 

B. The branch router had to resolve the application server MAC address. 

C. There is a short delay while NAT translates the server IP address. 

D. A routing table lookup delayed forwarding on the first two ping packets. 

E. The branch router LAN interface should be upgraded to FastEthernet. 

Answer:

Explanation: 

Initially the MAC address had to be resolved, but once it is resolved and is in the ARP table of the router, pings go through immediately. 

Q94. – (Topic 5) 

What is the purpose of the switchport command? 

Switch(config-if)# switchport port-security maximum 1 

Switch(config-if)# switchport port-security mac-address 0018.DE8B.4BF8 

A. It ensures that only the device with the MAC address 0018.DE8B.4BF8 will be able to connect to the port that is being configured. 

B. It informs the switch that traffic destined for MAC address 0018.DE8B.4BF8 should only be sent to the port that is being configured. 

C. It will act like an access list and the port will filter packets that have a source or destination MAC of 0018.DE8B.4BF8. 

D. The switch will shut down the port of any traffic with source MAC address of 0018.DE8B.4BF8. 

Answer:

Explanation: 

The first command configurs the maximum number of secure MAC addresses on a port to one. The next command specifies that MAC addresses that are allowed with port security; in this case it is just the one single device MAC. If any other device connects on that port the port will be shut down by the port security feature. 

Q95. – (Topic 4) 

The ip helper-address command does what? 

A. assigns an IP address to a host 

B. resolves an IP address from a DNS server 

C. relays a DHCP request across networks 

D. resolves an IP address overlapping issue 

Answer:

Explanation: 

http://cisconet.com/tcpip/dhcp/107-how-to-use-ip-helper-address-to-connect-remote-dhcp-

server.html 

When the DHCP client sends the DHCP request packet, it doesn’t have an IP address. So it uses the all-zeroes address, 0.0.0.0, as the IP source address. And it doesn’t know how to reach the DHCP server, so it uses a general broadcast address, 255.255.255.255, for the destination. So the router must replace the source address with its own IP address, for the interface that received the request. And it replaces the destination address with the address specified in the ip helper-address command. The client device’s MAC address is included in the payload of the original DHCP request packet, so the router doesn’t need to do anything to ensure that the server receives this information. The router then relays the DHCP request to the DHCP server. 

Q96. – (Topic 3) 

Which IP address is a private address? 

A. 12.0.0.1 

B. 168.172.19.39 

C. 172.20.14.36 

D. 172.33.194.30 

E. 192.169.42.34 

Answer:

Q97. – (Topic 5) 

Refer to the exhibit. 

A person is trying to send a file from a host on Network A of the JAX Company to a server 

on Network Z of the XYZ Company. The file transfer fails. The host on Network A can communicate with other hosts on Network A. 

Which command, issued from router RTA, would be the most useful for troubleshooting this problem? 

A. show flash: 

B. show history 

C. show version 

D. show interfaces 

E. show controllers serial 

Answer:

Explanation: 

The most useful thing to check on RTA would be the show interfaces command to see if the interface toward the WAN link is up. The most likely scenario is that the local LAN interface is up, but the other interface toward the XYZ company is down. 

Q98. – (Topic 3) 

Given an IP address of 192.168.1.42 255.255.255.248, what is the subnet address? 

A. 192.168.1.8/29 

B. 192.168.1.32/27 

C. 192.168.1.40/29 

D. 192.168.1.16/28 

E. 192.168.1.48/29 

Answer:

Explanation: 

248 mask uses 5 bits (1111 1000) 

42 IP in binary is (0010 1010) 

The base subnet therefore is the lowest binary value that can be written without changing 

the output of an AND operation of the subnet mask and IP… 

1111 1000 AND 

0010 1010 equals 

0010 1000 – which is .40 

/24 is standard class C mask. 

Adding the 5 bits from the .248 mask gives /29 

Q99. – (Topic 3) 

Which of the following IP addresses are valid Class B host addresses if a default Class B mask is in use? (Choose two.) 

A. 10.6.8.35 

B. 133.6.5.4 

C. 192.168.5.9 

D. 127.0.0.1 

E. 190.6.5.4 

Answer: B,E 

Explanation: 

The IP addresses 133.6.5.4 and 190.6.5.4 are both valid Class B addresses when a default mask is in use. The Class B default mask is 255.255.0.0 and the range of valid addresses is 128.0.0.0-

191.255.255.255. 

The IP address 10.6.8.35 is a Class A address. The Class A default mask is 255.0.0.0 and 

the range of valid addresses is 1.0.0.0 – 127.255.255.255, with the exception of the range 

127.0.0.1 – 127.255.255.255, which is reserved and cannot be assigned. 

The IP address 192.168.5.9 is a Class C address. The Class C default mask is 

255.255.255.0 and the range of valid addresses is 192.0.0.0 – 223.255.255.255. 

The IP address 127.0.0.1 is a Class A address, but it comes from a reserved portion that 

cannot be assigned. 

The range 127.0.0.1 – 127.255.255.255 is used for diagnostics, and although any address 

in the range will work as a diagnostic address, 127.0.0.1 is known as the loopback address. 

If you can ping this address, or any address in the 127.0.0.1 – 127.255.255.255 range, then 

the NIC is working and TCP/IP is installed. The Class A default mask is 255.0.0.0 and the range of valid addresses is 1.0.0.0 – 127.255.255.255, with the exception of the range 

127.0.0.1 – 127.255.255.255, which is reserved and cannot be assigned. 

Q100. – (Topic 1) 

Refer to the exhibit. 

The output is from a router in a large enterprise. From the output, determine the role of the router. 

A. A Core router. 

B. The HQ Internet gateway router. 

C. The WAN router at the central site. 

D. Remote stub router at a remote site. 

Answer:

Explanation: 

Since the routing table shows only a single default route using the single interface serial 0/0, we know that this is most likely a remote stub site with a single connection to the rest of the network. All the other answer options would mean that this router would have more connections, and would contain more routes. 

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