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[100% Pass Guarantee] Latest Cisco 400-101 Dumps Exam Questions And Answers

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The best Cisco 400-101 dumps exam CCIE Routing and Switching Written Cisco 400-101 training resources which are the best for clearing CCIE Routing and Switching Written Cisco 400-101 test, and to get certified by Cisco 400-101 dumps exam practice questions and answers online download free try. It is a best choice to accelerate your career as a professional in the Information Technology industry.

Question No : 1
What is the cause of ignores and overruns on an interface, when the overall traffic rate of the interface is low?
A. a hardware failure of the interface
B. a software bug
C. a bad cable
D. microbursts of traffic
Answer: D

Micro-bursting is a phenomenon where rapid bursts of data packets are sent in quick succession, leading to periods of full line-rate transmission that can overflow packet buffers of the network stack, both in network endpoints and routers and switches inside the network.

Symptoms of micro bursts will manifest in the form of ignores and/ or overruns (also shown as accumulated in “input error” counter within show interface output). This is indicative of receive ring and corresponding packet buffer being overwhelmed due to 400-101 pdf data bursts coming in over extremely short period of time (microseconds). You will never see a sustained data traffic within show interface’s “input rate” counter as they are averaging bits per second (bps) over 5 minutes by default (way too long to account for microbursts). You can understand microbursts from a scenario where a 3-lane highway merging into a single lane at rush hour – the capacity burst cannot exceed the total available bandwidth (i.e. single lane), but it can saturate it for a period of time.

Question No : 2
Refer to the exhibit.
Routers R1 and R2 are configured as shown, and traffic from R1 fails to reach host
Which action can you take to correct the problem?
A. Ensure that R2 has a default route in its routing table.
B. Change the OSPF area type on R1 and R2.
C. Edit the router configurations so that address is a routable address.
D. Remove the default-information originate command from the OSPF configuration of R2.
Answer: A

Not sure that any of these answers are correct, it appears that this configuration is valid for reaching that one specific host IP. Answer A does have a route to that host so it would not need a default route to get to 400-101 vce it. Choice B is incorrect as the area types have nothing to do with this. C is incorrect as that IP address is routable, and D is needed so that R1 will have a default route advertised to it from R2 so that it can reach this destination.

Question No : 3
Refer to the exhibit.
Which statement about the output is true?
A. The flow is an HTTPS connection to the router, which is initiated by
B. The flow is an HTTP connection to the router, which is initiated by
C. The flow is an HTTPS connection that is initiated by the router and that goes to
D. The flow is an HTTP connection that is initiated by the router and that goes to
Answer: A

We can see that the connection is initiated by the 400-101 exam Source IP address shown as We also see that the destination protocol (DstP) shows 01BB, which is in hex and translates to 443 in decimal. SSL/HTTPS uses port 443.

Question No : 4
Which statement is true regarding the UDP checksum?
A. It is used for congestion control.
B. It cannot be all zeros.
C. It is used by some Internet worms to hide their propagation.
D. It is computed based on the IP pseudo-header.
Answer: D

The method used to compute the checksum is defined in RFC 768: “Checksum is the 16-bit one’s complement of the one’s complement sum of a pseudo header of information from the IP header, the Cisco 400-101 dumps UDP header, and the data, padded with zero octets at the end (if necessary) to make a multiple of two octets.” In other words, all 16-bit words are summed using one’s complement arithmetic. Add the 16-bit values up. Each time a carry-out (17th bit) is produced, swing that bit around and add it back into the least significant bit. The sum is then one’s complemented to yield the value of the UDP checksum field. If the checksum calculation results in the value zero (all 16 bits 0) it should be sent as the one’s complement (all 1s).

Reference: http://www.cisco.com/c/en/us/training-events/training-certifications/exams/current-list/ccie-routing-switching.html