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2021 Apr 100-105 exam question

Q11. - (Topic 1) 

Which transport layer protocol provides best-effort delivery service with no acknowledgment receipt required? 

A. HTTP 

B. IP 

C. TCP 

D. Telnet 

E. UDP 

Answer:

Explanation: 

UDP provides a connectionless datagram service that offers best-effort delivery, which means that UDP does not guarantee delivery or verify sequencing for any datagrams. A source host that needs reliable communication must use either TCP or a program that provides its own sequencing and acknowledgment services. 


Q12. - (Topic 4) 

How many addresses will be available for dynamic NAT translation when a router is configured with the following commands? 

Router(config)#ip nat pool TAME 209.165.201.23 209.165.201.30 netmask 

255.255.255.224 

Router(config)#ip nat inside source list 9 pool TAME 

A. 7 

B. 8 

C. 9 

D. 10 

E. 24 

F. 32 

Answer:

Explanation: 

209.165.201.23 to 209.165.201.30 provides for 8 addresses. 


Q13. - (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. 


Q14. - (Topic 4) 

In the configuration of NAT, what does the keyword overload signify? 

A. When bandwidth is insufficient, some hosts will not be allowed to access network translation. 

B. The pool of IP addresses has been exhausted. 

C. Multiple internal hosts will use one IP address to access external network resources. 

D. If the number of available IP addresses is exceeded, excess traffic will use the specified address pool. 

Answer:

Explanation: 

The keyword overload.used in the ip nat inside source list 1 pool ovrld overload example command allows NAT to translate multiple inside devices to the single address in the pool. The types of NAT include: Static address translation (static NAT)—Allows one-to-one mapping between local and global addresses. Dynamic address translation (dynamic NAT)—Maps unregistered IP addresses to registered IP addresses from a pool of registered IP addresses. Overloading—Maps multiple unregistered IP addresses to a single registered IP address (many to one) using different ports. This method is also known as Port Address Translation (PAT). By using overloading, thousands of users can be connected to the Internet by using only one real global IP address. 


Q15. - (Topic 1) 

Which two characteristics apply to Layer 2 switches? (Choose two.) 

A. Increases the number of collision domains 

B. Decreases the number of collision domains 

C. Implements VLAN 

D. Decreases the number of broadcast domains 

E. Uses the IP address to make decisions for forwarding data packets 

Answer: A,C 

Explanation: 

Layer 2 switches offer a number of benefits to hubs, such as the use of VLANs and each switch port is in its own separate collision domain, thus eliminating collisions on the segment. 


Replace 100-105 latest exam:

Q16. - (Topic 3) 

Which two commands will display the current IP address and basic Layer 1 and 2 status of an interface? (Choose two.) 

A. router#show version 

B. router#show ip interface 

C. router#show protocols 

D. router#show controllers 

E. router#show running-config 

Answer: B,C 

Explanation: 

The outputs of “show protocols” and “show ip interface” are shown below: 

Global values:Internet Protocol routing is enabledSerial0/0 is up, line protocol is downInternet address is 10.1.1.1/30Serial0/1 is up, line protocol is downInternet address is 209.65.200.225/30Serial0/2 is up, line protocol is downSerial0/3 is up, line protocol is downNVI0 is up, line protocol is upInterface is unnumbered. Using address of NVI0 (0.0.0.0)Loopback0 is up, line protocol is upInternet address is 10.1.10.1/32Loopback1 is up, line protocol is upInternet address is 10.1.2.1/27Loopback6 is up, line protocol is up 

Serial0/0 is up, line protocol is downInternet address is 10.1.1.1/30Broadcast address is 255.255.255.255Address determined by non-volatile memoryMTU is 1500 bytesHelper address is not setDirected broadcast forwarding is disabledMulticast reserved groups joined: 224.0.0.5Outgoing access list is not setInbound access list is not setProxy ARP is enabledLocal Proxy ARP is disabledSecurity level is defaultSplit horizon is disabledICMP redirects are always sentICMP unreachables are always sentICMP mask replies are never sentIP fast switching is enabledIP fast switching on the same interface is enabledIP Flow switching is disabledIP CEF switching is disabledIP Feature Fast switching turbo vectorIP multicast fast switching is enabledIP multicast distributed fast switching is disabledIP route-cache flags are FastRouter Discovery is disabledIP output packet accounting is disabledIP access violation accounting is disabledTCP/IP header compression is disabledRTP/IP header compression is disabledPolicy routing is disabledNetwork address translation is enabled, interface in domain insideBGP Policy Mapping is disabledWCCP Redirect outbound is disabledWCCP Redirect inbound is disabledWCCP Redirect exclude is disabled 


Q17. - (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 


Q18. - (Topic 3) 

Refer to the exhibit. 

Given the output for this command, if the router ID has not been manually set, what router ID will OSPF use for this router? 

A. 10.1.1.2 

B. 10.154.154.1 

C. 172.16.5.1 

D. 192.168.5.3 

Answer:

Explanation: 

The highest IP address of all loopback interfaces will be chosen -> Loopback 0 will be chosen as the router ID. 


Q19. - (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. 


Q20. - (Topic 5) 

Refer to the exhibit. 

An administrator replaced the 10/100 Mb NIC in a desktop PC with a 1 Gb NIC and now the PC will not connect to the network. The administrator began troubleshooting on the switch. Using the switch output shown, what is the cause of the problem? 

A. Speed is set to 100Mb/s. 

B. Input flow control is off. 

C. Encapsulation is set to ARPA. 

D. The port is administratively down. 

E. The counters have never been cleared. 

Answer:

Explanation: 

For PC to switch connectivity, the speed settings must match. In this case, the 1 Gb NIC will not be able to communicate with a 100Mb fast Ethernet interface, unless the 1Gb NIC can be configured to connect at 100Mb.