ICND Interconnecting Cisco Networking Devices Part 1

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

  • You have 724 total questions across 145 pages (5 per page)
  • These questions were last updated on March 22, 2026
  • This site is not affiliated with or endorsed by Cisco.
Question 1 of 724
Which address type does a switch use to make selective forwarding decisions?
Answer

Suggested Answer

The suggested answer is E.

Switches analyze the destination MAC to make its forwarding decision since it is a layer 2 device.
Routers use the destination IP address to make forwarding decisions.
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Question 2 of 724
In which two ways does TCP differ from UDP? (Choose two.)
Answer

Suggested Answer

The suggested answer is 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.

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Question 3 of 724
Under which circumstance should a network administrator implement one-way NAT?
Answer

Suggested Answer

The suggested answer is 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 724
Which destination IP address can a host use to send one message to multiple devices across different subnets?
Answer

Suggested Answer

The suggested answer is D.

Multicast is a networking protocol where one host can send a message to a special multicast IP address and one or more network devices can listen for and receive those messages.
Multicast works by taking advantage of the existing IPv4 networking infrastructure, and it does so in something of a weird fashion. As you read, keep in mind that things are a little confusing because multicast was "shoe-horned" in to an existing technology. For the rest of this article, let's use the multicast IP address of
239.255.0.1.
Question 5 of 724
Which option must occur before a workstation can exchange HTTP packets with a web server?
Answer

Suggested Answer

The suggested answer is F.

HTTP uses TCP port 80.
http://pentestlab.wordpress.com/2012/03/05/common-tcpip-ports/

About the Cisco 100-105 Certification Exam

About the Exam

The Cisco 100-105 (ICND Interconnecting Cisco Networking Devices Part 1) validates your knowledge and skills. Passing demonstrates proficiency and can boost your career prospects in the field.

How to Prepare

Work through all 724 practice questions across 145 pages. Focus on understanding the reasoning behind each answer rather than memorizing responses to be ready for any variation on the real exam.

Why Practice Exams?

Practice exams help you familiarize yourself with the question format, manage your time, and reduce anxiety on the test day. Our 100-105 questions are regularly updated to reflect the latest exam objectives.