100-105 | how many questions of 100-105 braindumps?

Question No: 10

An administrator is working with the 192.168.4.0 network, which has been subnetted with a /26 mask. Which two addresses can be assigned to hosts within the same subnet? (Choose two.)

A. 192.168.4.61

B. 192.168.4.63

C. 192.168.4.67

D. 192.168.4.125

E. 192.168.4.128

F. 192.168.4.132

Answer: C,D

Explanation:

Increment: 64 (/26 = 11111111.11111111.11111111.11000000)

The IP 192.168.4.0 belongs to class C. The default subnet mask of class C is /24 and it has been subnetted with a /26 mask so we have 2(26-24) = 22 = 4 sub-networks:

1st subnet: 192.168.4.0 (to 192.168.4.63)

2nd subnet: 192.168.4.64 (to 192.168.4.127)

3rd subnet: 192.168.4.128 (to 192.168.4.191)

4th subnet: 192.168.4.192 (to 192.168.4.225)

In all the answers above, only answer C and D are in the same subnet. Therefore only IPs in this range can be assigned to hosts.

Question No: 11

What is the best practice when assigning IP addresses in a small office of six hosts?

A. Use a DHCP server that is located at the headquarters.

B. Use a DHCP server that is located at the branch office.

C. Assign the addresses by using the local CDP protocol.

D. Assign the addresses statically on each node.

Answer: D

Explanation:

Its best to use static addressing scheme where the number of systems is manageable rather than using a dynamic method such as DHCP as it is easy to operate and manage.

Question No: 12

Refer to the exhibit.

The ports that are shown are the only active ports on the switch. The MAC address table is shown in its entirety. The Ethernet frame that is shown arrives at the switch.

What two operations will the switch perform when it receives this frame? (Choose two.)

A. The MAC address of 0000.00aa.aaaa will be added to the MAC address table.

B. The MAC address of 0000.00dd.dddd will be added to the MAC address table.

C. The frame will be forwarded out of port fa0/3 only.

D. The frame will be forwarded out of fa0/1, fa0/2, and fa0/3.

E. The frame will be forwarded out of all the active ports.

Answer: A,D

Explanation:

If the switch already has the MAC address in its table for the destination, it will forward the frame directly to the destination port. If it was not already in its MAC table, then they frame would have been flooded out all ports except for the port that it came from. It will also add the MAC address of the source device to its MAC address table

Question No: 13

What happens when computers on a private network attempt to connect to the Internet through a Cisco router running PAT?

A. The router uses the same IP address but a different TCP source port number for each connection.

B. An IP address is assigned based on the priority of the computer requesting the connection.

C. The router selects an address from a pool of one-to-one address mappings held in the lookup table.

D. The router assigns a unique IP address from a pool of legally registered addresses for the duration of the connection.

Answer: A

Explanation:

Reference: http://www.cisco.com/en/US/docs/security/asa/asa82/configuration/guide/nat_staticpat.html

Static PAT translations allow a specific UDP or TCP port on a global address to be translated to a specific port on a local address. That is, both the address and the port numbers are translated.

Static PAT is the same as static NAT, except that it enables you to specify the protocol (TCP or UDP) and port for the real and mapped addresses. Static PAT enables you to identify the same mapped address across many different static statements, provided that the port is different for each statement. You cannot use the same mapped address for multiple static NAT statements.

Port Address Translation makes the PC connect to the Internet but using different TCP source port.

Question No: 14

Which two statements describe the IP address 10.16.3.65/23? (Choose two.)

A. The subnet address is 10.16.3.0 255.255.254.0.

B. The lowest host address in the subnet is 10.16.2.1 255.255.254.0.

C. The last valid host address in the subnet is 10.16.2.254 255.255.254.0

D. The broadcast address of the subnet is 10.16.3.255 255.255.254.0.

E. The network is not subnetted.

Answer: B,D

Explanation:

The mask 255.255.254.0 (/23) used with a Class A address means that there are 15 subnet bits and 9 host bits. The block size in the third octet is 2 (256 - 254). So this makes the subnets in 0, 2, 4, 6, etc., all the way to 254. The host 10.16.3.65 is in the 2.0 subnet. The next subnet is 4.0, so the broadcast address for the 2.0 subnet is 3.255. The valid host addresses are 2.1 through 3.254

Question No: 15

Refer to the exhibit.

What must be configured to establish a successful connection from Host A to switch SW-A through router RT-A?

A. VLAN 1 on RT-A

B. IP routing on SW-A

C. default gateway on SW-A

D. crossover cable connecting SW-A and RT-A

Answer: C

Explanation:

In order for the switch to reach networks that are not local, such as networks attached to different interfaces of the router, it will need to set its default gateway to be the IP address of the attached router.

Question No: 16

How many simultaneous Telnet sessions does a Cisco router support by default?

A. 1

B. 2

C. 3

D. 4

E. 5

F. 6

Answer: E

Explanation:

By default, Cisco routers support virtual terminal interfaces 0-4 (5 total) which are used for telnet sessions.

Question No: 17

Which statement describes the process ID that is used to run OSPF on a router?

A. It is globally significant and is used to represent the AS number.

B. It is locally significant and is used to identify an instance of the OSPF database.

C. It is globally significant and is used to identify OSPF stub areas.

D. It is locally significant and must be the same throughout an area.

Answer: B

Explanation:

The Process ID for OSPF on a router is only locally significant and you can use the same number on each router, or each router can have a different number-it just doesn't matter. The numbers you can use are from 1 to 65,535. Don't get this confused with area numbers, which can be from 0 to 4.2 billion.

Question No: 18

Scenario

Refer to the topology. Your company has decided to connect the main office with three other remote branch offices using point-to-point serial links.

You are required to troubleshoot and resolve OSPF neighbor adjacency issues between the main office and the routers located in the remote branch offices.

R1 does not form an OSPF neighbor adjacency with R2. Which option would fix the issue?

A. R1 ethernetO/1 is shutdown. Configure no shutdown command.

B. R1 ethernetO/1 configured with a non-default OSPF hello interval of 25: configure no ip ospf hello-interval 25

C. R2 ethernetO/1 and R3 ethernetO/O are configured with a non-default OSPF hello interval of 25; configure no ip ospf hello-interval 25

D. Enable OSPF for R1 ethernetO/1; configure ip ospf 1 area 0 command under ethernetO/1

Answer: B

Explanation:

Looking at the configuration of R1, we see that R1 is configured with a hello interval of 25 on interface Ethernet 0/1 while R2 is left with the default of 10 (not configured).

Question No: 19

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