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SDM Questions

September 21st, 2017 in SWITCH 300-115 Go to comments

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

Comments
  1. David
    May 7th, 2015

    Q4 Correct Answer: C
    Explanation:
    SDM Template Notes:
    All templates are predefined. There is no way to edit template category individual values.
    The switch reload is required to use a new SDM template.
    The ACL merge algorithm, as opposed to the original access control entries (ACEs) configured by the user, generate the number of TCAM entries listed for security and QoS ACEs.
    The first eight lines (up to Security ACEs) represent approximate hardware boundaries set when a template is used. If the boundary is exceeded, all processing overflow is sent to the CPU which can have a major impact on the performance of the switch.
    Choosing the VLAN template will actually disable routing (number of entry for unicast or multicast route is zero) in hardware.
    Reference:http://www.cisco.com/c/en/us/support/docs/switches/catalyst-3750-series-switches/44921-swdatabase-3750ss-44921.html

  2. KeyF
    June 9th, 2015

    I add a note for Q4.
    LAN BAse means that routing protocols are not supported, but in any case inter-Vlan routing is supported. If sdm “vlan” template is choosed then no space is allocated in ASIC for IPv4 routing entries. This should mean that FIB is not used and all routed traffic is done by L3 process engine.

  3. Paulo_Moura
    June 23rd, 2015

    Q4 is correct

    If a section of a hardware resource is full, all processing overflow is sent to the CPU, seriously impacting switch performance. The last row is a guideline used to calculate hardware resource consumption related to the number of Layer 2 VLANs on the switch.

  4. Wally
    July 1st, 2015

    I think Q4 should say IP base rather that LAN base feature. IP base support full L2 and L3 features. LAN base only supports full L2 functionality, per
    http://www.cisco.com/c/en/us/products/collateral/switches/catalyst-3560-x-series-switches/white_paper_c11-579326.html

  5. xyz
    September 3rd, 2015

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  6. A
    October 21st, 2015

    Q4

    Statement in D is factually correct. From cisco.com link in Q1 “When you select and configure SDM templates, you must reload the switch for the configuration to take effect.” but it’s not the most pertinent response to the scenario presented because it somewhat assumes sdm vlan template is already in use.

  7. Hani
    October 30th, 2015

    Guys, where is the questions?

  8. niko
    January 7th, 2016

    HI,

    where are the questions ?

    thanks

  9. Arash
    February 1st, 2016

    Hi Guys
    Q4 C is Correct
    On switches running the IP base or IP services feature set, use the sdm prefer vlan global
    configuration command only on switches intended for Layer 2 switching with no routing.
    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.

  10. pappi
    March 13th, 2016

    Q4 is horribly worded. Nothing in the question suggests that routing is in use at all. In fact, it implies routing is not in use by stating that LAN base is in use.

  11. FustratedCCNPLoser
    March 26th, 2016

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  12. jatin jesse
    June 11th, 2016

    SDM Template Configuration Guidelines
    Follow these guidelines when selecting and configuring SDM templates:

    •When you select and configure SDM templates, you must reload the switch for the configuration to take effect.

    •Use the sdm prefer vlan global configuration command only on switches intended for Layer 2 switching with no routing. 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.

    •Do not use the routing template if you do not have routing enabled on your switch. The sdm prefer routing global configuration command prevents other features from using the memory allocated to unicast routing in the routing template.

    •If you try to configure IPv6 features without first selecting a dual IPv4 and IPv6 template, a warning message is generated.

    •Using the dual stack templates results in less TCAM capacity allowed for each resource, so do not use if you plan to forward only IPv4 traffic.

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    August 1st, 2016

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    August 6th, 2016

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  15. SHANE
    September 28th, 2016

    CAN SOMEONE PLEASE EXPLAIN WHY C IS THE ANSWER,
    THANKS.

    A network engineer deployed a switch that operates the LAN base feature set and decides to use the SDM VLAN template. The SDM template is causing the CPU of the switch to spike during peak working hours. What is the root cause of this issue?

    A. The VLAN receives additional frames from neighboring switches.
    B. The SDM VLAN template causes the MAC address-table to overflow.
    C. The VLAN template disables routing in hardware.
    D. The switch needs to be rebooted before the SDM template takes effect.
    Answer: C

  16. rava
    October 18th, 2016

    Q4 C is correct

    On switches running LAN Base
    VLAN template is used to disable routing and supporting maximum unicast MAC addresses.

    thats the root cause…

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    December 27th, 2016

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  18. Cisco Test
    February 15th, 2017

    If a switch stack is configured to use SDM templates, where are the templates stored?

    A. all stack members
    B. stack master
    C. TFTP server
    D. flash memory

  19. need 2.1%
    February 24th, 2017

    Cisco Test I will go with B -> From Cisco 3750 documentation… “all stack members must use the same SDM
    desktop template that is stored on the stack master.”

  20. Mr.Smith
    February 26th, 2017

    I would choose A. The templates are already built/stored into each switch and can’t be manually adjusted. The switch master dictates what template the member switches must use but the members don’t download the template from the master. they use the template that is already built/stored on itself. If, you have a mixed stacked of different models it is possible to receive a SDM template mismatch error if the member switch doesn’t support the template the master dictates it to use.

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    March 20th, 2017

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    August 13th, 2017
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  31. Anonymous
    October 9th, 2017

    If a switch stack is configured to use SDM templates, where are the templates stored?
    A. all stack members
    B. stack master
    C. TFTP server
    D. flash memory

    what is the correct answer – A or B?

  32. Anonymous
    October 10th, 2017
  33. Anonymous
    October 10th, 2017

    SDM Templates and Switch Stacks

    All stack members use the same SDM template that is stored on the stack master. When a new switch is added to a stack, as with the switch configuration and VLAN database files, the SDM configuration that is stored on the stack master overrides the template configured on an individual switch.

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

  34. Anonymous
    October 10th, 2017

    SDM Template Configuration Guidelines

    When you select and configure SDM templates, you must reload the switch for the configuration to take effect.

    After the system reboots, you can use the show sdm prefer privileged EXEC command to verify the new template configuration.

    If you enter the show sdm prefer command before you enter the reload privileged EXEC command, the show sdm prefer command shows the template in use and the template that becomes active after a reload.

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