ICND Interconnecting Cisco Networking Devices Part 1

Here you have the best Cisco 100-105 practice exam questions

You have 461 total questions to study from
Each page has 5 questions, making a total of 93 pages
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This questions were last updated on October 19, 2025
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Question 1 of 461

Which address type does a switch use to make selective forwarding decisions?

destination IP address

source MAC address

source IP address

source and destination IP address

destination MAC address

Correct Answer: E

Question 2 of 461

In which two ways does TCP differ from UDP? (Choose two.)

TCP provides synchronized communication.

TCP segments are essentially datagrams.

TCP provides sequence numbering of packets.

TCP uses broadcast delivery.

TCP provides best effort delivery.

Correct Answer: A, C

TCP differs from UDP primarily in two ways: it provides synchronized communication to ensure that both ends of the connection are in agreement about the state of the communication, and it provides sequence numbering of packets to ensure data is received in the correct order. These features enable reliable, ordered, and error-checked delivery of a stream of packets. UDP, on the other hand, does not offer these reliability features and is used for faster, connectionless communication.

Question 3 of 461

Under which circumstance should a network administrator implement one-way NAT?

when the network must route UDP traffic

when traffic that originates outside the network must be routed to internal hosts

when traffic that originates inside the network must be routed to internal hosts

when the network has few public IP addresses and many private IP addresses require outside access

Correct Answer: B

One-way NAT is used when traffic that originates outside the network must be routed to internal hosts. This configuration helps manage situations where internal hosts use private IP addresses that are not directly accessible from the internet. By implementing one-way NAT, the network administrator can translate the destination IP address of incoming packets from the outside network to the appropriate internal private IP address, allowing external sources to communicate with internal hosts. This setup is crucial for services that need to be accessed from outside the network, such as web servers or mail servers hosted internally.

Question 4 of 461

Which destination IP address can a host use to send one message to multiple devices across different subnets?

172.20.1.0

127.0.0.1

192.168.0.119

239.255.0.1

Correct Answer: D

Question 5 of 461

Refer to the exhibit.
Exam 100-105: Question 5 - Image 1

Which statement describes the effect of this configuration?

The VLAN 10 VTP configuration is displayed.

The VLAN 10 spanning-tree output is displayed.

The VLAN 10 configuration is saved when the router exits VLAN configuration mode.

VLAN 10 is added to the VLAN database.

Correct Answer: C

The configuration shown does not immediately add VLAN 10 to the VLAN database. Instead, the VLAN 10 configuration is committed and saved only when the router exits VLAN configuration mode. Until then, any 'do show vlan' command used while still in configuration mode might not show the new VLAN 10 as it hasn't been fully created and saved yet.