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Miscellaneous Questions

July 8th, 2017 in ROUTE 300-101 Go to comments

Question 1

Explanation

The command “clear ip route” clears one or more routes from both the unicast RIB (IP routing table) and all the module Forwarding Information Bases (FIBs).

Question 2

Explanation

The prefix-list “ip prefix-list name permit 10.8.0.0/16 ge 24 le 24” means
+ Check the first 16 bits of the prefix. It must be 10.8
+ The subnet mask must be greater or equal 24
+ The subnet mask must be less than or equal 24

-> The subnet mask must be exactly 24

Therefore the suitable prefix that is matched by above ip prefix-list should be 10.8.x.x/24

Question 3

Explanation

This is a new user (client) that has not been configured to accept SSL VPN connection. So that user must open a web browser, enter the URL and login successfully to be authenticated. A small software will also be downloaded and installed on the client computer for the first time. Next time the user can access file shares on that network normally.

Question 4

Explanation

Fragmentation and Path Maximum Transmission Unit Discovery (PMTUD) is a standardized technique to determine the maximum transmission unit (MTU) size on the network path between two hosts, usually with the goal of avoiding IP fragmentation. PMTUD was originally intended for routers in IPv4. However, all modern operating systems use it on endpoints.

Note: IP fragmentation involves breaking a datagram into a number of pieces that can be reassembled later.

Question 5

Explanation

Bandwidth-delay product (BDP) is the maximum amount of data “in-transit” at any point in time, between two endpoints. In other words, it is the amount of data “in flight” needed to saturate the link. You can think the link between two devices as a pipe. The cross section of the pipe represents the bandwidth and the length of the pipe represents the delay (the propagation delay due to the length of the pipe).

Therefore the Volume of the pipe = Bandwidth x Delay. The volume of the pipe is also the BDP.

Bandwidth-delay_Product.jpg

Return to our question, the formula to calculate BDP is:

BDP (bits) = total available bandwidth (bits/sec) * round trip time (sec) = 64,000 * 3 = 192,000 bits

-> BDP (bytes) = 192,000 / 8 = 24,000 bytes

Therefore we need 24KB to fulfill this link.

For your information, BDP is very important in TCP communication as it optimizes the use of bandwidth on a link. As you know, a disadvantage of TCP is it has to wait for an acknowledgment from the receiver before sending another data. The waiting time may be very long and we may not utilize full bandwidth of the link for the transmission.

Bandwidth-delay_Product_Wasted.jpg

Based on BDP, the sending host can increase the number of data sent on a link (usually by increasing the window size). In other words, the sending host can fill the whole pipe with data and no bandwidth is wasted.Bandwidth-delay_Product_Optimized.jpg

Question 6

Question 7

Explanation

Asymmetric routing is the scenario in which outing packet is through a path, returning packet is through another path. VRRP can cause asymmetric routing occur, for example:

R1 and R2 are the two routers in the local internal LAN network that are running VRRP. R1 is the master router and R2 is the backup router.

These two routers are connected to an ISP gateway router, by using BGP. This topology provides two possible outgoing and incoming paths for the traffic.

Suppose the outgoing traffic is sent through R1 but VRRP failover occurs, R2 becomes the new master router -> traffic passing through R2 instead -> asymmetric routing occurs.

Question 8

Question 9

Comments
  1. most specific
    August 22nd, 2017

    Qu 9 Reasons:
    https://en.wikipedia.org/wiki/Route_filtering

    Economic reasons[edit]
    When a site is multihomed, announcing non-local routes to a neighbour different from the one it was learned from amounts to advertising the willingness to serve for transit, which is undesirable unless suitable agreements are in place. Applying output filtering on these routes avoids this issue.

    Security reasons[edit]
    An ISP will typically perform input filtering on routes learned from a customer to restrict them to the addresses actually assigned to that customer. Doing so makes address hijacking more difficult.

    Similarly, an ISP will perform input filtering on routes learned from other ISPs to protect its customers from address hijacking.

    Technical reasons[edit]
    In some cases, routers have insufficient amounts of main memory to hold the full global BGP table. A simple work-around is to perform input filtering, thus limiting the local route database to a subset of the global table.[1] This can be done by filtering on prefix length (eliminating all routes for prefixes longer than a given value), on AS count, or on some combination of the two; security is the most important point for this.

    However, this practice is not recommended, as it can cause suboptimal routing[2] or even communication failures with small networks[citation needed], and frustrate the traffic-engineering efforts of one’s peers.

  2. Valid
    October 16th, 2017

    Passed 9xx. very easy.
    Studied this forum and the new dumps from IT-Libraries

  3. Shad
    November 9th, 2017
  4. Alvaro
    November 28th, 2017

    Passed with the 21q dumps, all questions were from there.

  5. Wilbur
    November 28th, 2017

    Confirming the 440q dumps are valid. I used the ones from it Libaries.

  6. Anonymous
    December 5th, 2017

    @Buck- The document shared has 416 Questions. Were these enough to pass?

  7. Gavin
    December 5th, 2017

    Smashed my route exam today, 9xx used the dumps from it libraries and tut.

  8. Maja
    January 14th, 2018

    Q7: In which scenario can asymmetric routing occur?
    In Dexter Dump the answer is A: active/active firewall setup
    Any gues?

  9. Orval
    January 15th, 2018

    Passed, if you go the exam study the 440q dumps.

  10. Rizwan
    February 14th, 2018

    Q7 in dexter dumps show option A. active/active firewall setup as correct answer please confirm the correct answer

  11. MM
    February 28th, 2018

    for Q7, is it active/active firewall or the one is marked as correct here?

  12. salman
    March 9th, 2018

    any update for Question 7 which is correct A or D. Please someone guide us

  13. Marcus
    March 30th, 2018

    About Q7. I guess answer is D. A firewall is not the REASON for asymmetric routing itself. Yes, we can have a issue with firewall and asymmetric routing, but the question asks about the ASR occuring, NOT about problems with ASR and firewall. ASR can occur with redundancy paths and load balancing. See Official Cert Guide, Chapter 1. So, I think, best answer is D (about VRRP).

  14. unstoppable
    April 20th, 2018

    I hope Marcus is here.
    anyone else could help me?
    I don’t understand why question 6 answer cannot be C. speed duplex link issues
    I remember last time I have speed issue and it cause the VoIP quality suffer.
    after I set the speed of that that specific port to a fix speed and full duplex then solve the issue.

  15. Marcus
    May 5th, 2018

    @unstoppable, the questions says “out-of-order”. In case with speed or duplex issues you would have a packet drops, not out-of-order. UDP doesn’t care about packet retransmission itself, so it would not happens without intervention of upper-level protocols. Besides, with VoIP traffic a retransmission doesn’t have a sense. So, the most obvious answer is “load balancing”, as mentioned in dump. I think it’s correct answer.

  16. Someone17
    May 7th, 2018

    Q7
    In which scenario can asymmetric routing occur?

    A. active/active firewall setup
    B. single path in and out of the network.
    C. active/standby firewall setup
    D. redundant routers running VRRP

    Answer is A 100% see below

    Asymmetric Routing Support in Active Active Mode

    In general, avoid asymmetric routing in a firewall design solution. The ASR feature is purely to protect issues such as link failovers. Note that even though state is shared between the Active and Standby firewalls periodically, it is possible to have race conditions, which could cause connections to be dropped.

    Active/Active failover with ASR is a design advantage for parallel paths across firewalls with the same security rule sets. Care should be taken for Active/Active redundancy and the Layer 3 network symmetry. This depends on each environment, and limitations may arise based on individual scenarios.

    https://www.ccexpert.us/interface-vlan/asymmetric-routing-support-in-activeactive-mode.html

    Please digitaltut Correct the issue Answer is A

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    June 6th, 2018

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  18. oola
    June 10th, 2018

    ol

  19. abood
    July 23rd, 2018

    where are the questions? can any one tell me where to get the questions. thanks

  20. NotABot
    August 12th, 2018

    *promotions*

  21. Bot
    August 12th, 2018

    Bot stuff.

  22. Treyon
    September 3rd, 2018

    A network engineer receives reports about poor voice quality issues at a remote site. The network engineer does a packet capture and sees out-of-order packets being delivered. Which option can cause the VOIP quality to suffer?
    A. traffic over backup redundant links
    B. misconfigured voice vlan
    C. speed duplex link issues
    D. load balancing over redundant links
    What’s the difference between A and D ???

  23. Anonymous
    October 12th, 2018

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