[2021-New] Cisco 100-105 Dumps With Update Exam Questions (21-30)

100-105 Dumps

100-105 Exam Questions - Online Test

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Q1. - (Topic 1)

Refer to the exhibit.

The exhibit is showing the topology and the MAC address table. Host A sends a data frame to host D. What will the switch do when it receives the frame from host A?

A. The switch will add the source address and port to the MAC address table and forward the frame to host D.

B. The switch will discard the frame and send an error message back to host A.

C. The switch will flood the frame out of all ports except for port Fa0/3.

D. The switch will add the destination address of the frame to the MAC address table and forward the frame to host D.

Answer: A

Explanation:

When switch receives the data frame from the host not having the MAC address already on the MAC table, it will add the MAC address to source port on MAC address table and sends the data frame.

Q2. - (Topic 4)

Refer to the exhibit.

A company wants to use NAT in the network shown. Which commands will apply the NAT configuration to the proper interfaces? (Choose two.)

A. R1(config)# interface serial0/1 R1(config-if)# ip nat inside

B. R1(config)# interface serial0/1 R1(config-if)# ip nat outside

C. R1(config)# interface fastethernet0/0 R1(config-if)# ip nat inside

D. R1(config)# interface fastethernet0/0 R1(config-if)# ip nat outside

E. R1(config)# interface serial0/1 R1(config-if)# ip nat outside source pool 200.2.2.18 255.255.255.252

F. R1(config)# interface fastethernet0/0 R1(config-if)# ip nat inside source 10.10.0.0 255.255.255.0

Answer: B,C

Explanation:

For NAT, you need to define which interfaces are inside and which are outside. The outside interface is the one that connects to the external network, and the one that will be used for translating addresses. The inside interface is for the internal network, and defines the network IP addresses that will get translated to the one specified in the outside network.

Q3. - (Topic 3)

OSPF routing uses the concept of areas. What are the characteristics of OSPF areas? (Choose Three.)

A. Each OSPF area requires a loopback interface to be configured.

B. Areas may be assigned any number from 0 to 65535.

C. Area 0 is called the backbone area.

D. Hierarchical OSPF networks do not require multiple areas.

E. Multiple OSPF areas must connect to area 0.

F. Single area OSPF networks must be configured in area 1.

Answer: B,C,E

Explanation:

Definition of OSPF areas: An OSPF network may be structured, or subdivided, into routing areas to simplify administration and optimize traffic and resource utilization. Areas are identified by 32-bit numbers, expressed either simply in decimal, or often in octet-based dot-decimal notation, familiar from IPv4 address notation.

See discussion following Cisco Learning discussion.

https://learningnetwork.cisco.com/message/90832

Q4. - (Topic 5)

Refer to the exhibit.

A user cannot reach any web sites on the Internet, but others in the department are not

having a problem.

What is the most likely cause of the problem?

A. IP routing is not enabled.

B. The default gateway is not in the same subnet.

C. A DNS server address is not reachable by the PC.

D. A DHCP server address is not reachable by the PC.

E. NAT has not been configured on the router that connects to the Internet.

Answer: C

Explanation:

Answer C is only answer that makes sense. IP routing does not need to be enabled on PC’s, this is a router function. We can see from the output that the PC and default gateway are on the same subnet. DHCP has not been enabled on this PC so it has been configured with a static address so reaching the DHCP server is not the issue. Finally, NAT must be configured correctly or the other users in the department would also be having issues.

Q5. - (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: E

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.

Q6. - (Topic 3)

Which two of these statements are true of IPv6 address representation? (Choose two.)

A. There are four types of IPv6 addresses: unicast, multicast, anycast, and broadcast.

B. A single interface may be assigned multiple IPv6 addresses of any type.

C. Every IPv6 interface contains at least one loopback address.

D. The first 64 bits represent the dynamically created interface ID.

E. Leading zeros in an IPv6 16 bit hexadecimal field are mandatory.

Answer: B,C

Explanation:

A single interface may be assigned multiple addresses of any type (unicast, anycast,

multicast).

Every IPv6-enabled interface must contain at least one loopback and one link-local

address.

Optionally, every interface can have multiple unique local and global addresses.

IPv6 host addresses can be assigned in multiple ways:

Static configuration

Stateless autoconfiguration

DHCPv6

When IPv6 is used over Ethernet networks, the Ethernet MAC address can be used to

generate the 64-bit interface ID for the host. This is called the EUI-64 address.

Since MAC addresses use 48 bits, additional bits must be inserted to fill the 64 bits

required.

Reference:

http://www.cisco.com/en/US/technologies/tk648/tk872/technologies_white_paper0900aecd

8026003d.pdf

Q7. - (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.

Q8. - (Topic 1)

A workstation has just resolved a browser URL to the IP address of a server. What protocol will the workstation now use to determine the destination MAC address to be placed into frames directed toward the server?

A. HTTP

B. DNS

C. DHCP

D. RARP

E. ARP

Answer: E

Explanation:

The RARP protocol is used to translate hardware interface addresses to protocol addresses. The RARP message format is very similar to the ARP format. When the booting computer sends the broadcast ARP request, it places its own hardware address in both the sending and receiving fields in the encapsulated ARP data packet. The RARP server will fill in the correct sending and receiving IP addresses in its response to the message. This way the booting computer will know its IP address when it gets the message from the RARP server

Q9. - (Topic 3)

Which IP addresses are valid for hosts belonging to the 10.1.160.0/20 subnet? (Choose three.)

A. 10.1.168.0

B. 10.1.176.1

C. 10.1.174.255

D. 10.1.160.255

E. 10.1.160.0

F. 10.1.175.255

Answer: A,C,D

Explanation:

All IP address in IP ranges between: 10.1.160.1 and 10.1.175.254 are valid as shown below Address: 10.1.160.0 00001010.00000001.1010 0000.00000000 Netmask: 255.255.240.0 = 20 11111111.11111111.1111 0000.00000000 Wildcard: 0.0.15.255 00000000.00000000.0000 1111.11111111

Which implies that: Network: 10.1.160.0/20 00001010.00000001.1010 0000.00000000 HostMin: 10.1.160.1 00001010.00000001.1010 0000.00000001 HostMax: 10.1.175.254 00001010.00000001.1010 1111.11111110 Broadcast: 10.1.175.255 00001010.00000001.1010 1111.11111111

Q10. - (Topic 5)

Refer to the exhibit.

For security reasons, information about RTA, including platform and IP addresses, should not be accessible from the Internet. This information should, however, be accessible to devices on the internal networks of RTA.

Which command or series of commands will accomplish these objectives?

A. RTA(config)#no cdp run

B. RTA(config)#no cdp enable

C. RTA(config)#interface s0/0 RTA(config-if)#no cdp run

D. RTA(config)#interface s0/0 RTA(config-if)#no cdp enable

Answer: D

Explanation:

http://www.cisco.com/en/US/tech/tk962/technologies_tech_note09186a00801aa000.shtml# topicenab

When CDP is enabled globally using the cdp run command, it is enabled by default on all supported interfaces (except for Frame Relay multipoint subinterfaces) to send and receive CDP information. You can disable CDP on an interface that supports CDP with the no cdp enable command.

Router#show cdp neighbors

Capability Codes: R - Router, T - Trans Bridge, B - Source Route Bridge S - Switch, H - Host, I - IGMP, r – Repeater

Router# On this router, CDP is enabled on Serial 1 and Ethernet 0 interfaces. Disable CDP on the Serial 1 interface and verify if the neighbor device is discovered on the serial 1 interface, as this output shows: Router#configure terminal Enter configuration commands, one per line. End with CNTL/Z. Router(config)#interface s1 Router(config-if)#no cdp enable Router(config-if)# Z Router#4w5D. %SYS-5-CONFIG_I: Configured from console by console