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New Cisco 100-105 Exam Dumps Collection (Question 8 - Question 17)

Q8. Refer to the exhibit.

The network is converged.After link-state advertisements are received from Router_A, what information will Router_E contain in its routing table for the subnets 208.149.23.64 and 208.149.23.96?

A. 208.149.23.64[110/13] via 190.173.23.10, 00:00:07, FastEthemet0/0

208.149.23.96[110/13] via 190.173.23.10, 00:00:16, FastEthemet0/0

B. 208.149.23.64[110/1] via 190.172.23.10, 00:00:07, Serial1/0

208.149.23.96[110/3] via 190.173.23.10, 00:00:16, FastEthemet0/0

C. 208.149.23.64[110/13] via 190.173.23.10, 00:00:07, Serial1/0

208.149.23.96[110/13] via 190.173.23.10, 00:00:16, Serial1/0

208.149.23.96[110/13] via 190.173.23.10, 00:00:16, FastEthemet0/0

D. 208.149.23.64[110/3] via 190.172.23.10, 00:00:07, Serial1/0

208.149.23.96[110/3] via 190.173.23.10, 00:00:16, Serial1/0

Answer: A

Explanation:

Router_E learns two subnets subnets 208.149.23.64 and 208.149.23.96 via Router_A through FastEthernet interface. The interface cost is calculated with the formula 108 / Bandwidth. For FastEthernet it is 108 / 100 Mbps = 108 / 100,000,000 = 1. Therefore the

cost is 12 (learned from Router_A) + 1 = 13 for both subnets ->

The cost through T1 link is much higher than through T3 link (T1 cost = 108 / 1.544 Mbps = 64; T3 cost = 108 / 45 Mbps = 2) so surely OSPF will choose the path through T3 link -> Router_E will choose the path from Router_A through FastEthernet0/0, not Serial1/0.

In fact, we can quickly eliminate answers B, C and D because they contain at least one subnet learned from Serial1/0 -> they are surely incorrect.


Q9. Why would a network administrator configure port security on a switch?

A. to prevent unauthorized Telnet access to a switch port

B. to prevent unauthorized hosts from accessing the LAN

C. to limit the number of Layer 2 broadcasts on a particular switch port

D. block unauthorized access to the switch management interfaces

Answer: B

Explanation:

You can use the port security feature to restrict input to an interface by limiting and identifying MAC addresses of the stations allowed to access the port. When you assign secure MAC addresses to a secure port, the port does not forward packets with source addresses outside the group of defined addresses. If you limit the number of secure MAC addresses to one and assign a single secure MAC address, the workstation attached to that port is assured the full bandwidth of the port.

If a port is configured as a secure port and the maximum number of secure MAC addresses is reached, when the MAC address of a station attempting to access the port is different from any of the identified secure MAC addresses, a security violation occurs. Also, if a station with a secure MAC address configured or learned on one secure port attempts to access another secure port, a violation is flagged.


Q10. OSPF is configured using default classful addressing. With all routers and interfaces operational, how many networks will be in the routing table of R1 that are indicated to be learned by OSPF?

A. 2

B. 3

C. 4

D. 5

E. 6

F. 7

Answer: C

Explanation:

Although OSPF is configured using default classful addressing but OSPF is a link-state routing protocol so it will always send the subnet mask of each network in their advertised routes. Therefore R1 will learn the the complete subnets. Four networks list below will be in the routing table of R1:+ 172.16.2.64/30+ 172.16.2.228/30+ 172.16.2.232/30+ 172.16.3.0/24

Note: Other networks will be learned as u201cDirectly connectedu201d networks (marked with letter u201cCu201d)


Q11. 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.


Q12. Refer to the exhibit.

Why was this message received?

A. No VTY password has been set.

B. No enable password has been set.

C. No console password has been set.

D. No enable secret password has been set.

E. The login command has not been set on CON 0

F. The login command has not been set on the VTY ports.

Answer: A

Explanation:

Your CCNA certification exam is likely going to contain questions about Telnet, an application-level protocol that allows remote communication between two networking devices. With Telnet use being as common as it is, you had better know the details of how to configure it in order to pass your CCNA exam and to work in real-world networks.

The basic concept is pretty simple - we want to configure R1, but we're at R2. If we telnet successfully to R1, we will be able to configure R1 if we've been given the proper permission levels. In this CCNA case study, R2 has an IP address of 172.12.123.2 and R1 an address of 172.12.123.1. Let's try to telnet from R2 to R1.

R2#telnet 172.12.123.1

Trying 172.12.123.1 ... Open Password required, but none set

[Connection to 172.12.123.1 closed by foreign host]

This seems like a problem, but it's a problem we're happy to have. A Cisco router will not let any user telnet to it by default. That's a good thing, because we don't want just anyone connecting to our router! The "password required" message means that no password has been set on the VTY lines on R1. Let's do so now.

R1(config)#line vty 0 4

R1(config-line)#password baseball

A password of "baseball" has been set on the VTY lines, so we shouldn't have any trouble using Telnet to get from R2 to R1. Let's try that now.

R2#telnet 172.12.123.1

Trying 172.12.123.1 ... Open User Access Verification Password:

R1>

We're in, and placed into user exec mode. Reference:

http://www.mcmcse.com/cisco/guides/telnet_passwords_and_privilege_levels.shtml


Q13. What is the default administrative distance of OSPF?

A. 90

B. 100

C. 110

D. 120

Answer: C

Explanation:

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.

Default Distance Value Table

This table lists the administrative distance default values of the protocols that Cisco supports:


Q14. Refer to the exhibit.

SwitchA receives the frame with the addressing shown in the exhibit. According to the command output also shown in the exhibit, how will SwitchA handle this frame?

A. It will drop the frame.

B. It will forward the frame out port Fa0/6 only.

C. It will forward the frame out port Fa0/3 only.

D. It will flood the frame out all ports.

E. It will flood the frame out all ports except Fa0/3.

Answer: E

Explanation:

When frame receives the frame, it checks the source address on MAC table if MAC address found in MAC table it tries to forward if not in MAC table adds the Address on MAC table. After checking the source address, it checks the destination address on MAC table, if MAC address found on MAC table it forwards to proper ports otherwise floods on all ports except the source port.


Q15. Which two options will help to solve the problem of a network that is suffering a broadcast storm? (Choose two.)

A. a bridge

B. a router

C. a hub

D. a Layer 3 switch

E. an access point

Answer: B,D

Explanation:

Routers and layer 3 switches will not propagate broadcast traffic beyond the local segment, so the use of these devices is the best method for eliminating broadcast storms.


Q16. What does a host on an Ethernet network do when it is creating a frame and it does not have the destination address?

A. Drops the frame

B. Sends out a Layer 3 broadcast message

C. Sends a message to the router requesting the address

D. Sends out an ARP request with the destination IP address

Answer: D

Explanation:

In this case, it will send out an ARP request for MAC address of the destination IP (assuming it doesn't already have it in its table) and then address it to the destination's MAC address.


Q17. Which network device functions only at Layer 1 of the OSI model?

A. Option A

B. Option B

C. Option C

D. Option D

E. Option E

Answer: B

Explanation:

Most hubs are amplifying the electrical signal; therefore, they are really repeaters with several ports. Hubs and repeaters are Layer 1 (physical layer) devices.


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