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Exam Code: 400-101
Exam Name: CCIE Routing and Switching Written v5.0
Updated: May 18, 2017
The teststarter 400-101 dumps is the qualification exam for the Routing and Switching CCIE Track’s Lab exam. After you have passed 400-101 (or 350-101 if still within your initial 18-month testing window), you can schedule your CCIE R&S Lab exam to become a fully qualified CCIE!
Teststarter.com is the ultimate preparation source for passing the Cisco 400-101 exam. We have carefully complied real exam questions and answers, which are updated frequently, and reviewed by industry experts.
Teststarter Latest and Most Accurate Cisco 200-105 PDF Exam Q&As
Question No : 1 – (Topic 1)Refer to the exhibit
ICMP Echo requests from host A are not reaching the intended destination on host B. What
is the problem?
A. The ICMP payload is malformed.
B. The ICMP Identifier (BE) is invalid.
C. The negotiation of the connection failed.
D. The packet is dropped at the next hop.
E. The link is congested.
Here we see that the Time to Live (TTL) value of the packet is one, so it will be forwarded
to the next hop router, but then dropped because the TTL value will be 0 at the next hop.
Question No : 2 – (Topic 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
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
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 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 : 3 DRAG DROP – (Topic 1)
Drag and drop the extended ping command field on the left to its usage on the right.
Question No : 4 – (Topic 1) 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 188.8.131.52.
B. The flow is an HTTP connection to the router, which is initiated by 184.108.40.206.
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
We can see that the connection is initiated by the Source IP address shown as
220.127.116.11. 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 : 5 – (Topic 1)
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 18.104.22.168 is a routable address.
D. Remove the default-information originate command from the OSPF configuration of R2.
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 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 : 6 – (Topic 1)
Which statement describes the purpose of the Payload Type field in the RTP header?
A. It identifies the signaling protocol.
B. It identifies the codec.
C. It identifies the port numbers for RTP.
D. It identifies the port numbers for RTCP.
PT, Payload Type. 7 bits: Identifies the format of the RTP payload and determines its
interpretation by the application. A profile specifies a default static mapping of payload type
codes to payload formats. Additional payload type codes may be defined dynamically
through non-RTP means. An RTP sender emits a single RTP payload type at any given
time; this field is not intended for multiplexing separate media streams. A full list of codecs
and their payload type values can be found at the link below:
Question No : 7 – (Topic 1) How many hash buckets does Cisco Express Forwarding use for load balancing?
In order to understand how the load balance takes place, you must first see how the tables
relate. The Cisco Express Forwarding table points to 16 hash buckets (load share table),
which point to the adjacency table for parallel paths. Each packet to be switched is broken
up into the source and destination address pair and checked against the loadshare table.
Question No : 8 – (Topic 1) 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.
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 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).
After months of cramming I finally got around to sitting the CCIE Routing and Switching written exam teststarter 400-101 dumps.
I got to the testing centre nice and early, and sat waiting to be taken through to the room. I wasn’t feeling all that nervous, the only nerves were all around the cost of having to resit it if I failed.
Once in the room we go through all the usual identity checks, drivers license, something else with signature, do two more signatures and have my photo taken. Then we are in the room and I sit down.
Our Cisco experts from multiple organizations are talented and qualified individuals who have reviewed each question and answer explanation section in order to help you understand the concept and pass the teststarter 400-101 dumps. The best way to prepare for an exam is not reading a text book, but taking practice questions and understanding the correct answers. Practice questions help prepare students for not only the concepts, but also the manner in which questions and answer options are presented during the real exam.