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

Question No: 2

Which device allows users to connect to the network using a single or double radio?

A. access point

B. switch

C. wireless controller

D. firewall

Answer: A

Question No: 3

From where does a small network get its IP network address?

A. Internet Assigned Numbers Authority (IANA)

B. Internet Architecture Board (IAB)

C. Internet Service Provider (ISP)

D. Internet Domain Name Registry (IDNR)

Answer: C

Question No: 4

When enabled, which feature prevents routing protocols from sending hello messages on an interface'?

A. virtual links

B. passive-interface

C. directed neighbors

D. OSPF areas

Answer: B

Explanation:

You can use the passive-interfacecommand in order to control the advertisement of routing information. The command enables the suppression of routing updates over some interfaces while it allows updates to be exchanged normally over other interfaces.

With most routing protocols, the passive-interface command restricts outgoing advertisements only. But, when used with Enhanced Interior Gateway Routing Protocol (EIGRP), the effect is slightly different. This document demonstrates that use of the passive-interface command in EIGRP suppresses the exchange of hello packets between two routers, which results in the loss of their neighbor relationship. This stops not only routing updates from being advertised, but it also suppresses incoming routing updates. This document also discusses the configuration required in order to allow the suppression of outgoing routing updates, while it also allows incoming routing updates to be learned normally from the neighbor.

Question No: 5

Which subnet address is for the IP address 172.19.20.23/28?

A. 172.19.20.20

B. 172.19.20.0

C. 172.19.20.32

D. 172.19.20.15

E. 172.19.20.16

Answer: E

Question No: 6

Refer to the topology and partial configurations shown in the exhibit.

The network administrator has finished configuring the NewYork and Sydney routers and issues the command ping Sydney from the NewYork router. The ping fails. What command or set of commands should the network administrator issue to correct this problem?

A. Sydney(config)# interface s0/0 Sydney(config-if)#cdp enable

B. Sydney(config)# interface s0/0 Sydney(config-if)# no shut

C. Sydney(config)# line vty 0 4 Sydney(config)# login Sydney(config)# password Sydney

D. Sydney(config)# ip host Sydney 10.1.1.9

E. Sydney(config)# interface s0/0

Sydney(config-if)#ip address 10.1.1.5 255.255.255.252 NewYork(config)# ip host Sydney 10.1.1.5

Answer: E

Explanation:

The IP addresses on the two Serial interfaces of two routers are not in the same subnet so they could not recognize each other and the ping failed. Therefore we must correct the IP address of one of the router so that they are in the same subnet.

Question No: 7

Which component of the routing table ranks routing protocols according to their preferences?

A. administrative distance

B. next hop

C. metric

D. routing protocol code

Answer: A

Explanation:

Administrative distance - This is the measure of trustworthiness of the source of the route. If a router learns about a destination from more than one routing protocol, administrative distance is compared and the preference is given to the routes with lower

administrative distance. In other words, it is the believability of the source of the route.

Question No: 8

Which sequence begins a unique local IPv6 address in binary notation?

A. 00000000

B. 1111110

C. 1111100

D. 1111111

Answer: B

Question No: 9

The system LED is amber on a Cisco Catalyst 2950 series switch. What does this indicate?

A. The system is not powered up.

B. The system is powered up and operational.

C. The system is malfunctioning.

D. The system is forwarding traffic.

E. The system is sensing excessive collisions.

Answer: C

Explanation: Explanation

The system LED shows whether the system is receiving power and functioning properly. Below lists the LED colors and meanings:

Color

System Status

Off

System is not powered up. Green

System is operating normally. Amber

System is receiving power but is not functioning properly. (Reference:

http://www.cisco.com/en/US/docs/switches/lan/catalyst2950/hardware/installation/guide/hg ovrev.html)

Question No: 10

After you configure a default route to the Internet on a router, the route is missing from the routing table. Which option describes a possible reason for the problem?

A. The next-hop address is unreachable.

B. The default route was configured on a passive interface.

C. Dynamic routing is disabled.

D. Cisco Discovery Protocol is disabled on the interface used to reach the next hop.

Answer: A

Question No: 11

Which RFC was created to alleviate the depletion of IPv4 public addresses?

A. RFC 4193

B. RFC 1519

C. RFC 1518

D. RFC 1918

Answer: C

Explanation: Explanation

The RFC 1518 is Classless Interdomain Routing (CIDR). CIDR is a mechanism developed

to help alleviate the problem of exhaustion of IP addresses and growth of routing tables. The problems were:

+ With the classful routing system, individual networks were either limited to 254 hosts (/24) or 65,534 hosts (/16). For many network enterprises, 254 hosts were not enough and 65,534 were too large to be used efficiently.

+ Routing information overload. The size and rate of growth of the routing tables in Internet routers is beyond the ability of current software (and people) to effectively manage.

+ Eventual exhaustion of IP network numbers.

To solve these problem, CIDR was selected as the solution in 1992.

In contrast to classful routing, which categorizes addresses into one of three blocks, CIDR allows for blocks of IP addresses to be allocated to Internet service providers. The blocks are then split up and assigned to the provideru2021s customers.

According to the CIDR standard, the first part of an IP address is a prefix, which identifies the network. The prefix is followed by the host identifier so that information packets can be sent to particular computers within the network. A CIDR address includes the standard 32- bit IP address and also the network prefix. For example, a CIDR address of 200.1.45.2/26, the u201c/26u201d indicates the first 26 bits are used to identify the unique network, leaving the remaining bits to identify the specific hosts.

Therefore, instead of assigning the whole block of a class B or C address, now smaller blocks of a class can be assigned. For example, instead of assigning a whole block of 200.1.45.0/24, a smaller block, like 200.1.45.0/27 or 200.1.45.32/27, can be assigned. In fact, CIDR is specified in RFCs 1518,1519 and 1520 so answer u201cRFC 1519u201d is also acceptable.