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SDM Questions

November 27th, 2019 in SWITCH 300-115 Go to comments
SDM Quick summary

SDM templates are used to configure system resources in the switch to optimize support for specific features, depending on how the switch is used in the network. You can select a template to provide maximum system usage for some functions or use the default template to balance resources.

To allocate ternary content addressable memory (TCAM) resources for different usages, the switch SDM templates prioritize system resources to optimize support for certain features. You can select SDM templates to optimize these features:
+ Access – The access template maximizes system resources for access control lists (ACLs) to accommodate a large number of ACLs.
+ Default – The default template gives balance to all functions.
+ Routing – The routing template maximizes system resources for IPv4 unicast routing, typically required for a router or aggregator in the center of a network.
+ VLANs – The VLAN template disables routing and supports the maximum number of unicast MAC addresses. It would typically be selected for a Layer 2 switch.

In addition, the dual IPv4 and IPv6 templates enable a dual stack environment.

In order to configure SDM template, use this command under global configuration mode: sdm prefer {access | default | dual-ipv4-and-ipv6 {default | routing | vlan} | routing | vlan}.
For example: Switch(config)# sdm prefer routing or Switch(config)# sdm prefer dual-ipv4-and-ipv6 default

Command to verify SDM template: show sdm prefer

In a switch stack, SDM template is stored in the master switch.

Question 1

Explanation

SDM templates are used to configure system resources in the switch to optimize support for specific features, depending on how the switch is used in the network. You can select a template to provide maximum system usage for some functions or use the default template to balance resources.

To allocate ternary content addressable memory (TCAM) resources for different usages, the switch SDM templates prioritize system resources to optimize support for certain features. You can select SDM templates to optimize these features:
+ Access – The access template maximizes system resources for access control lists (ACLs) to accommodate a large number of ACLs.
+ Default – The default template gives balance to all functions.
+ Routing – The routing template maximizes system resources for IPv4 unicast routing, typically required for a router or aggregator in the center of a network.
+ VLANs – The VLAN template disables routing and supports the maximum number of unicast MAC addresses. It would typically be selected for a Layer 2 switch.

In addition, the dual IPv4 and IPv6 templates enable a dual stack environment.

Reference: http://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst3750/software/release/12-2_55_se/configuration/guide/scg3750/swsdm.html

Question 2

Explanation

The VLAN template disables routing and supports the maximum number of unicast MAC addresses. It would typically be selected for a Layer 2 switch.

Question 3

Explanation

The VLAN template disables routing and supports the maximum number of unicast MAC addresses. It would typically be selected for a Layer 2 switch.

Question 4

Explanation

The VLAN template disables routing and supports the maximum number of unicast MAC addresses. It would typically be selected for a Layer 2 switch only. But in this case this switch is also used for routing. The VLAN template disabled routing feature so all routing processing is sent to the CPU, seriously impacting switch performance, causing the CPU of the switch to spike, especially during peak hours.

Question 5

Question 6

Question 7

Explanation

In fact there are only three correct choices in this question but we listed here all four correct answers so that you can see which ones are not correct.

SDM templates are used to configure system resources in the switch to optimize support for specific features, depending on how the switch is used in the network. You can select a template to provide maximum system usage for some functions or use the default template to balance resources.

To allocate ternary content addressable memory (TCAM) resources for different usages, the switch SDM templates prioritize system resources to optimize support for certain features. You can select SDM templates to optimize these features:
+ Access – The access template maximizes system resources for access control lists (ACLs) to accommodate a large number of ACLs.
+ Default – The default template gives balance to all functions.
+ Routing – The routing template maximizes system resources for IPv4 unicast routing, typically required for a router or aggregator in the center of a network.
+ VLANs – The VLAN template disables routing and supports the maximum number of unicast MAC addresses. It would typically be selected for a Layer 2 switch.

In addition, the dual IPv4 and IPv6 templates enable a dual stack environment.

Reference: http://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst3750/software/release/12-2_55_se/configuration/guide/scg3750/swsdm.html

Question 8

Question 9

Question 10

Question 11

Comments
Comment pages
1 2 757
  1. Andre
    February 5th, 2018

    For question 4

    ” But in this case this switch is also used for routing..”

    Where in the question it says that switch is used for routing?

  2. Hmsh
    February 6th, 2018

    question 4 is clearly saying that
    LAN base feature set
    and from https://blogs.cisco.com/enterprise/cisco-ios-software-licenses-what%E2%80%99s-what-for-layer-2-and-layer-3-switching-%E2%80%93-part-1
    it sayes LAN base Feature is for L2 Switchs …….+
    NO Routing is there
    I believe the answer is D
    it is a VLAN profile and the switch is working in a L2

  3. 1WAY
    February 12th, 2018

    Q11. What is the question?

  4. Marigona
    February 14th, 2018

    Hi guys,

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  5. Marigona
    February 14th, 2018

    Hi guys,

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  6. hallfawi
    February 28th, 2018

    dears, is this topic will be included in the exam?

  7. Test
    April 13th, 2018

    How do you get latest dump?

  8. lalaversa
    May 12th, 2018

    Q4.
    In reference to Hmsh, February 6th, 2018 comment, no D but C is correct.
    The question is clearly saying that LAN base feature set… then the VLAN template is working already, it not needs to be rebooted.
    If the SDM template is causing CPU spike during peak working hours it means that the switch is used also for routing. The VLAN template disabled routing feature so all routing processing is sent to the CPU causing seriously impacting switch performance (and causing the CPU of the switch to spike during peak working hours). Correct is C.

  9. Raito
    June 7th, 2018

    I agree with Hmsh. Cisco document clearly states:

    Do not select a routing template (sdm prefer routing) when the switch is running the LAN base feature set. Although visible in the command-line help, the LAN base feature set does not support routing. On switches running the LAN base feature set, routing values shown in the templates are not valid.

    This means that routing is not possible on the switch, so the CPU spikes have to be caused by something other than routing ! Only switching remains and hence the option with a reboot makes the most sense to me.

    Source:
    https://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst3750x_3560x/software/release/12-2_53_se/configuration/guide/3750xscg/swsdm.html

  10. nataliya
    June 13th, 2018

    @1WAY, yes, Q11 sounds stupid

  11. chuba
    July 31st, 2018

    Nataliya. Let me explain Q11, The Question is somewhat tricky but if you consider the question. it is already L2 (LAN Base Feature set) switch moved in to support both L2 and L3 environment (it default sdm template). so the cpu will generate spike due to some routing functionality of the switch.

  12. Kevin
    August 11th, 2018

    Passed the exam using prem dev dumps, good source you should try thats all i can say

  13. xiuo
    August 14th, 2018

    I passed the exam with a high score, only read the questions inside, share it with you, and wish you good luck.

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    August 14th, 2018

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  15. Jori
    February 2nd, 2019

    where do i get the questions?

  16. Tom
    February 18th, 2019

    Are there any up to date dumps available?

  17. elizo
    February 28th, 2019

    Hello guys,

    Trust y’all are doing great!
    I took the exam twice this month. I wrote on the 12th of Feb and on the 27th of Feb.

    The questions here are very valid. Forget all those fake guys coming to ask you to buy their fake dumps. Most of the valid dumpsites I used to know don’t have valid dumps anymore. The only valid questions in the dumps are the lab simulations. Apart from that, their questions are outdated.

    The first time took the exam to recertify my CCNP, I had 758/1000.

    The second time which was yesterday, I had 876/1000.

    I had so many new questions… in my 1st and 2nd attempt.

    I will update you as much as possible.

  18. 9TUT WATCHER
    March 2nd, 2019

    This place went out of business a few months ago.

  19. Anonymous
    March 12th, 2019

    Lab sims and and the questions are valid i passed my exam yesterday

  20. Anonymous
    April 30th, 2019

    Quiz links not working?

  21. Parms
    May 2nd, 2019

    Anonymous
    April 30th, 2019

    Quiz links not working?

    – had the same problem when using firefox. worked in IE11 and Chrome.

  22. psyco6@gmail.com
    July 29th, 2019

    Anyone have the latest files available? See user name for address

  23. Anonymous
    July 31st, 2019

    are the questions and labs still valid ?

  24. cisco4career@gmail.com
    August 1st, 2019

    who needs updated dump, plz contact me. Good luck!

  25. Anonymous
    September 10th, 2019

    Q4: You can still route with a VLAN SDM template, as it clearly states in the docs.

    SDM reconfigures the ASICS to optimize switch performance. The VLAN template simply removes routing from hardware. That then requires all routing to be done in the processor, which is very intensive.

    “When you use the VLAN template, no system resources are reserved for routing entries, and any routing is done through software. This overloads the CPU and severely degrades routing performance.”

  26. Anonymous
    September 10th, 2019

    Not ASICS, the database resources* hence the acronym.

    I’d edit the previous comment if I could to correct my statement.

  27. Anonymous
    September 10th, 2019

    BTW, notice that for Cisco devices, you have to enable (e.g. IP CEF) or modify settings (e.g. SDM) to make the device not suck as bad and to enable it to compete with other vendor comparable devices.

    Case in point: their firepower firewalls. Flakey, Frankenstein’d garbage at best.

    Cisco is not as great as they seem, but there certs are very useful for career progression.

  28. GreggemasH
    October 12th, 2019

    Хорошая статья

  29. Anonymous
    October 14th, 2019

    Quiz link doesn´t work

  30. Burìk
    November 8th, 2019

    Q4

    Well at least on my C3550, routing is *completely* disabled by the vlan template, not only in hardware.

    SWC_C3550_24P(config)#sdm prefer ?
    access multicast and qos/acl bias, drop unicast
    extended-match Using extended match for unicast routing
    routing unicast bias, drop qos/acl
    vlan vlan bias, drop routing

    SWC_C3550_24P(config)#sdm prefer vlan
    Changes to the running SDM preferences have been stored, but cannot take effect
    until the next reload.
    Use ‘show sdm prefer’ to see what SDM preference is currently active.

    NOTE: Use caution with ‘sdm prefer vlan’, as any current Layer3 configuration data
    will not be saved after a reload.

    *reload*

    SWC_C3550_24P#conf t
    Enter configuration commands, one per line. End with CNTL/Z.
    SWC_C3550_24P(config)#ip routing
    ^
    % Invalid input detected at ‘^’ marker.

    SWC_C3550_24P(config)#

    Perhaps this is not the case anymore with more recent stuff, if so C may be the only valid answer. Besides, I don’t know of any other template that would degrade CPU performance.

  31. Anonymous
    November 15th, 2019

    https://youtu.be/jqePPiR8URM
    for full SDM Theory and practicals

  32. georoot
    January 14th, 2020

    q7
    4 answers are correct, but the real question says choose three.
    what do you do?

  33. Q4
    January 16th, 2020

    The switch supports an IP Base software image (with or without payload encryption) for customers without a service support contract. This image supports the IP Base and LAN Base feature sets.

    LAN Base feature set—Provides basic Layer 2+ features, including access control lists (ACLs) and quality of service (QoS). Starting with Cisco IOS Release 12.2(58)SE, the LAN Base feature set also supports static IP routing on switch virtual interfaces (SVIs) for 16 user-configured routes.

    https://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst3750x_3560x/software/release/15-0_2_se/configuration/guide/3750x_cg/swintro.html

    Choosing the VLAN template will actually disable routing (number of entry for unicast or multicast route is zero) in hardware.

    https://www.cisco.com/c/en/us/support/docs/switches/catalyst-3750-series-switches/44921-swdatabase-3750ss-44921.html

    Q4 Answer C is correct!

  34. Suntzu
    January 17th, 2020

    A network engineer deployed a switch that operates the LAN base feature set and decides to use the SDM VLAN template

    REGARDLESS IF IT DISABLES HARDWARE BASED ROUTING 10% 50%, 70% OR 100%, the fact remains that it does in fact reduce routing in hardware and pushes it to the CPU.

    C is correct no matter how you look at it. SDM VLAN tells ASICS to only look at increase VLAN performance. Routing then has to go somewhere. It goes to the CPU!!

  35. x.sk/vL9oh
    January 21st, 2020

    Put “i” in start of my name and you will get download the file.
    guys, I passed the exam today, I got: (LACP with STP Sim)

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