CCIE Routing and Switching Written

Here you have the best Cisco 400-101 practice exam questions

You have 1058 total questions to study from
Each page has 5 questions, making a total of 212 pages
You can navigate through the pages using the buttons at the bottom
This questions were last updated on October 9, 2025
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Question 1 of 1058

What is a cause for unicast flooding?

Unicast flooding occurs when multicast traffic arrives on a Layer 2 switch that has directly connected multicast receivers.

When PIM snooping is not enabled, unicast flooding occurs on the switch that interconnects the PIM-enabled routers. "Pass Any Exam. Any Time." - www.actualtests.com 17

A man-in-the-middle attack can cause the ARP cache of an end host to have the wrong MAC address. Instead of having the MAC address of the default gateway, it has a MAC address of the man-in-the-middle. This causes all traffic to be unicast flooded through the man-in-the-middle, which can then sniff all packets.

Forwarding table overflow prevents new MAC addresses from being learned, and packets destined to those MAC addresses are flooded until space becomes

Correct Answer: D

Question 2 of 1058

Refer to the exhibit.
"Pass Any Exam. Any Time." - www.actualtests.com 18
Exam 400-101: Question 2 - Image 1

Video Source S is sending interactive video traffic to Video Receiver R. Router R1 has multiple routing table entries for destination R. Which load-balancing mechanism on R1 can cause out-of- order video traffic to be received by destination R?

per-flow load balancing on R1 for destination R

per-source-destination pair load balancing on R1 for destination R

CEF load balancing on R1 for destination R

per-packet load balancing on R1 for destination R

Correct Answer: D

Question 3 of 1058

What is Nagle's algorithm used for?

To increase the latency "Pass Any Exam. Any Time." - www.actualtests.com 19

To calculate the best path in distance vector routing protocols

To calculate the best path in link state routing protocols

To resolve issues caused by poorly implemented TCP flow control.

Correct Answer: D

Question 4 of 1058

Which statement is true regarding the UDP checksum?

It is used for congestion control.

It cannot be all zeros.

It is used by some Internet worms to hide their propagation.

It is computed based on the IP pseudo-header.

Correct Answer: D

Question 5 of 1058

Which statement describes the purpose of the Payload Type field in the RTP header?

It identifies the signaling protocol.

It identifies the codec.

It identifies the port numbers for RTP.

It identifies the port numbers for RTCP.

Correct Answer: B