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

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100-105 Exam Questions - Online Test

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Q1. - (Topic 7)

Which statement about static routes is true?

A. The source interface can be configured to make routing decisions.

B. A subnet mask is entered for the next-hop address.

C. The subnet mask is 255.255 255.0 by default

D. The exit interface can be specified to indicate where the packets will be routed.

Answer: D

Explanation:

Static routing can be used to define an exit point from a router when no other routes are available or necessary. This is called a default route.

Q2. - (Topic 3)

Which statements describe the routing protocol OSPF? (Choose three.)

A. It supports VLSM.

B. It is used to route between autonomous systems.

C. It confines network instability to one area of the network.

D. It increases routing overhead on the network.

E. It allows extensive control of routing updates.

F. It is simpler to configure than RIP v2.

Answer: A,C,E

Explanation:

Routing overhead is the amount of information needed to describe the changes in a dynamic network topology. All routers in an OSPF area have identical copies of the topology database and the topology database of one area is hidden from the rest of the areas to reduce routing overhead because fewer routing updates are sent and smaller routing trees are computed and maintained (allow extensive control of routing updates and confine network instability to one area of the network).

Q3. - (Topic 7)

Which route source code represents the routing protocol with a default administrative distance of 90 in the routing table?

A. S

B. E

C. D

D. R

E. O

Answer: C

Explanation:

SStatic EEGP DEIGRP RRIP OOSPF

Default Administrative distance of EIGRP protocol is 90 then answer is C

Default Distance Value TableThis table lists the administrative distance default values of the protocols that Cisco supports:

Route Source Default Distance Values

Connected interface 0 Static route 1 Enhanced Interior Gateway Routing Protocol (EIGRP) summary route 5 External Border Gateway Protocol (BGP) 20 Internal EIGRP 90 IGRP 100 OSPF 110 Intermediate System-to-Intermediate System (IS-IS) 115 Routing Information Protocol (RIP) 120 Exterior Gateway Protocol (EGP) 140 On Demand Routing (ODR) 160 External EIGRP 170 Internal BGP 200 Unknown* 255

Q4. - (Topic 7)

Which option is a valid hostname for a switch?

A. Switch-Cisco

B. Switch-Cisco!

C. SwitchCisco

D. SwitchCisc0

Answer: C

Q5. - (Topic 5)

Refer to the exhibit.

After the power-on-self test (POST), the system LED of a Cisco 2950 switch turns amber. What is the status of the switch?

A. The POST was successful.

B. The switch has a problem with the internal power supply and needs an external power supply to be attached.

C. POST failed and there is a problem that prevents the operating system from being loaded.

D. The switch has experienced an internal problem but data can still be forwarded at a slower rate.

E. The switch passed POST, but all the switch ports are busy.

Answer: C

Explanation:

http://www.cisco.com/en/US/products/hw/switches/ps607/products_tech_note09186a00801 25913.shtml

Each time you power up the switch, eight Power-On Self Tests (POSTs) run automatically. POSTs check the most important system components before the switch begins to forward packets. When the switch begins the POST, the port status LEDs display amber for two seconds, and then display green. As each test runs, the port status LEDs go out. 1x is the first to go out. The port status LEDs for ports 2x through 8x go out sequentially as the system completes a test. When the POST completes successfully, the port status LEDs go out. This indicates that the switch is operational. If a test fails, the port status LED associated with the test displays amber. The system LED also displays amber. Not E: From Cisco IOS Software Release 11.2(8.5) SA6 onwards, the port and system LEDs both remain amber after a POST failure. In the earlier Cisco IOS Software Releases, only the LEDs of failed linked ports remained amber.

Q6. - (Topic 3)

What is the subnet address of 172.16.159.159/22?

A. 172.16.0.0

B. 172.16.128.0

C. 172.16.156.0

D. 172.16.159.0

E. 172.16.159.128

F. 172.16.192.0

Answer: C

Explanation:

Converting to binary format it comes to 11111111.11111111.11111100.00000000 or

255.255.252.0 Starting with 172.16.0.0 and having increment of 4 we get.

Q7. - (Topic 3)

What command sequence will configure a router to run OSPF and add network 10.1.1.0 /24 to area 0?

A. router ospf area 0 network 10.1.1.0 255.255.255.0 area 0

B. router ospf network 10.1.1.0 0.0.0.255

C. router ospf 1 network 10.1.1.0 0.0.0.255 area 0

D. router ospf area 0 network 10.1.1.0 0.0.0.255 area 0

E. router ospf network 10.1.1.0 255.255.255.0 area 0 F. router ospf 1 network 10.1.1.0 0.0.0.255

Answer: C

Explanation:

Enabling OSPFSUMMARY STEPS

enable

configure terminal

router ospf process-id

network ip-address wildcard-mask area area-id

end

DETAILED STEPS

Command or Action Purpose Step.1 enable

Example:

Device> enable Enables privileged EXEC mode. . Enter your password if prompted.

Step.2 configure terminal

Example:

Device# configure terminal Enters global configuration mode.

Step.3 router ospf process-id

Example:

Device(config)# router ospf 109

Enables OSPF routing and enters router configuration mode.

Step.4 network ip-address wildcard-mask area area-id

Example:

Device(config-router)# network 192.168.129.16 0.0.0.3 area 0

Defines an interface on which OSPF runs and defines the area ID for that interface.

Step.5 end

Example:

Device(config-router)# end

Exits router configuration mode and returns to privileged EXEC mode.

Reference: http://www.cisco.com/c/en/us/td/docs/ios-xml/ios/iproute_ospf/configuration/12-4t/iro-12-4t-book/iro-cfg.html#GUID-588D1301-F63C-4DAC-BF1C-C3735EB13673

Q8. - (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

Q9. - (Topic 5)

An administrator has connected devices to a switch and, for security reasons, wants the dynamically learned MAC addresses from the address table added to the running configuration.

What must be done to accomplish this?

A. Enable port security and use the keyword sticky.

B. Set the switchport mode to trunk and save the running configuration.

C. Use the switchport protected command to have the MAC addresses added to the configuration.

D. Use the no switchport port-security command to allow MAC addresses to be added to the configuration.

Answer: A

Explanation:

http://www.cisco.com/en/US/docs/switches/lan/catalyst6500/ios/12.2SX/configuration/guide

/port_sec.pdf

One can configure MAC addresses to be sticky. These can be dynamically learned or manually configured, stored in the address table, and added to the running configuration. If these addresses are saved in the configuration file, the interface does not need to dynamically relearn them when the switch restarts, hence enabling security as desired.

Q10. - (Topic 3)

Which parameter or parameters are used to calculate OSPF cost in Cisco routers?

A. Bandwidth

B. Bandwidth and Delay

C. Bandwidth, Delay, and MTU

D. Bandwidth, MTU, Reliability, Delay, and Load

Answer: A

Explanation:

The well-known formula to calculate OSPF cost is Cost = 108/ Bandwidth