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IP SLA Questions

July 11th, 2017 in ROUTE 300-101 Go to comments

Question 1

Question 2

Explanation

IP SLA PBR (Policy-Based Routing) Object Tracking allows you to make sure that the next hop is reachable before that route is used. If the next hop is not reachable, another route is used as defined in the PBR configuration. If no other route is present in the route map, the routing table is used.

An example of configuring PBR based on tracking object is shown below:

//Configure and schedule IP SLA operations
ip sla 1
icmp-echo 10.3.3.2
ip sla schedule 1 life forever start-time now
!
// Configure Object Tracking to track the operations
track 1 ip sla 1 reachability
!
//Configure ACL
ip access-list standard ACL
permit ip 10.2.2.0/24 10.1.1.1/32
!
//Configure PBR policing on the router
route-map PBR
match ip address ACL
set ip next-hop verify-availability 10.3.3.2 track 1
set ip next-hop verify-availability 10.3.3.2 track 2 -> Track 2 is not shown here but it is used if track 1 fails
!
//Apply PBR policy on the incoming interface of the router.
interface ethernet 0/0
ip address 10.2.2.1 255.255.255.0
ip policy route-map PBR

Reference: http://www.cisco.com/c/en/us/td/docs/switches/datacenter/sw/6_x/nx-os/IPSLA/configuration/guide/b_Cisco_Nexus_7000_Series_NX-OS_IP_SLAs_Configuration_Guide_rel_6-x/b_Cisco_Nexus_7000_Series_NX-OS_IP_SLAs_Configuration_Guide_rel_6-x_chapter_01000.html

Question 3

Explanation

The keyword “tcp-connect” enables the responder for TCP connect operations. TCP is a connection-oriented transport layer protocol -> C is correct.

Question 4

Explanation

The “num-packets” specifies the number of packets to be sent for a jitter operation.

The “frequency” is the rate (in seconds) at which this IP SLA operation repeats. The “tos” defines a type of service (ToS) byte in the IP header of this IP SLA operation.

Question 5

Explanation

When enabled, the IP SLAs Responder allows the target device to take two time stamps both when the packet arrives on the interface at interrupt level and again just as it is leaving, eliminating the processing time. At times of high network activity, an ICMP ping test often shows a long and inaccurate response time, while an IP SLAs test shows an accurate response time due to the time stamping on the responder.

An additional benefit of the two time stamps at the target device is the ability to track one-way delay, jitter, and directional packet loss. Because much network behavior is asynchronous, it is critical to have these statistics. However, to capture one-way delay measurements the configuration of both the source device and target device with Network Time Protocol (NTP) is required. Both the source and target need to be synchronized to the same clock source. One-way jitter measurements do not require clock synchronization.

Reference: http://www.cisco.com/c/en/us/td/docs/ios-xml/ios/ipsla/configuration/15-mt/sla-15-mt-book/sla_overview.html

Question 6

Question 7

Question 8

Explanation

Depending on the specific Cisco IOS IP SLAs operation, statistics of delay, packet loss, jitter, packet sequence, connectivity, path, server response time, and download time are monitored within the Cisco device and stored in both CLI and SNMP MIBs.

Reference: http://www.cisco.com/c/en/us/td/docs/ios/12_4/ip_sla/configuration/guide/hsla_c/hsoverv.html

Question 9

Explanation

IP SLAs supports proactive threshold monitoring and notifications for performance parameters such as average jitter, unidirectional latency, bidirectional round-trip time (RTT), and connectivity for most IP SLAs operations. The proactive monitoring capability also provides options for configuring reaction thresholds for important VoIP related parameters including unidirectional jitter, unidirectional packet loss, and unidirectional VoIP voice quality scoring.

IP SLAs reactions are configured to trigger when a monitored value exceeds or falls below a specified level or when a monitored event, such as a timeout or connection loss, occurs. If IP SLAs measures too high or too low of any configured reaction, IP SLAs can generate a notification (in the form of SNMP trap) to a network management application or trigger another IP SLA operation to gather more data.

Cisco IOS IP SLAs can send SNMP traps that are triggered by events such as the following:
+ Connection loss
+ Timeout
+ Round-trip time threshold
+ Average jitter threshold
+ One-way packet loss
+ One-way jitter
+ One-way mean opinion score (MOS)
+ One-way latency

Question 10

Explanation

Round-trip time (RTT), also called round-trip delay, is the time required for a packet to travel from a specific source to a specific destination and back again.

An ICMP Path Echo operation measures end-to-end (full path) and hop-by-hop response time (round-trip delay) between a Cisco router and devices using IP. ICMP Path Echo is useful for determining network availability and for troubleshooting network connectivity issues.

Note: ICMP Echo only measures round-trip delay for the full path.

Reference: http://www.cisco.com/c/en/us/td/docs/ios-xml/ios/ipsla/configuration/xe-3s/sla-xe-3s-book/sla_icmp_pathecho.html

Question 11

Explanation

The default route command (at the last line) must include the “track” keyword for the tracking feature to work.

ip route 0.0.0.0.0 0.0.0.0 172.20.20.2 track 10

Question 12

Comments
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    January 15th, 2017

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  2. Anonymous
    February 1st, 2017

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  3. sanler
    February 3rd, 2017

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  4. Anonymous
    February 5th, 2017

    Not getting question 1. Both VRRP and HSRP can also automatically detect a WAN primary link failure and failover to the secondary link (by using a track statement). Why is the answer IP SLA?

  5. CCNP Route Exam prep – what is the status on the updates?
    February 9th, 2017

    CCNP Route Exam prep – what is the status on the updates?

  6. MMMM
    February 11th, 2017

    Which to reason for IP SLA tracking failure are likely true (Choose 2)
    The threshold value is wronga. A
    route back to the R1 LAN network is missing in R2b.
    The source-interface is configures correctlyc.
    The destination must be 172.30.30.2 for icmp-echod.

  7. Almond
    April 1st, 2017

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    May 14th, 2017

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  9. RishiRich
    May 19th, 2017

    I came across 7-8 new questions. “sh ip routing VRF” was one of them, I think someone has posted it here before.

    -In OSFP Evaluation Q:Which of the following statements is true about the serial links that terminate in R3?
    A. The R1-R3 link needs the neighbor command for the adjacency to stay up
    B. The R2-R3 link OSPF timer values are 30, 120, 120
    C. The R1-R3 link OSPF timer values should be 10,40,40
    D. R3 is responsible for flooding LSUs to all the routers on the network.

    Correct Answer was C if you check “sh ip ospf interfaces” command

    what does show ip route VRF CISCO provide?
    A. Routing table of VRF CISCO
    B. Global routing table
    C. Directly connected routes of CISCO VRF
    D. All routing table starting with CISCO
    Answer: A

    IP SLA Question was like : Why default route is not removed or something like that:

    A. The source-interface is configured incorrectly.
    B. The destination must be 172.30.30.2 for icmp-echo.
    C. A route back to the R1 LAN network is missing in R2.
    D. The default route has wrong next hop IP address.

    How to set up IP SLA to monitor Bandwidth between the certain limits

    A. Timer
    B. Frequency
    C. Threshold
    D. Queue-limit – I’m not sure

    I’ve chose threshold

  10. Aerin
    May 30th, 2017

    Passed last week, 851. Sims are valid, but several questions are completely new and not on this site. Lots of VPN, redistribution and IP SLA. No questions on BGP at all. Not even one.

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    July 18th, 2017

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    July 19th, 2017

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    July 23rd, 2017

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  18. dapo
    August 23rd, 2017

    Hi there,

    How come there is no question title or description?

    Thanks
    dapo

  19. Anonymous
    August 27th, 2017

    Question 12 is not very clear. As according to the Cisco’s own reference, the answer could also be IP-route tracking.

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    August 28th, 2017

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  25. Peter Pan
    October 7th, 2017

    Q6 – answer A or B ?

    B seems the better answer.

  26. learner
    October 13th, 2017

    Q 11:
    D. missing of track feature on default static route command – correct

    IP SLA Tracking with Configuration Example

    Configuration

    <ip sla 1

    icmp-echo 4.2.2.2
    timeout 500
    frequency 3

    ip sla schedule 1 start-time now life forever

    track 1 rtr 1 reachability

    now for the routing, we need to change the default route and associate it with the tracker

    no ip route 0.0.0.0 0.0.0.0 1.1.1.1

    and then put it back with the tracking

    ip route 0.0.0.0 0.0.0.0 1.1.1.1 track 1

    http://docwiki.cisco.com/wiki/IP_SLA_Tracking_with_Configuration_Example

  27. Colin
    October 31st, 2017

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    November 9th, 2017

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    November 11th, 2017

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    November 21st, 2017

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    November 28th, 2017

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  35. AdoJay
    February 8th, 2018

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  36. renewer
    April 9th, 2018

    Q6 @dgtut: Please correct the answer, should be A, not B. As per Cisco documentation:

    ” For state, if the return code is OK, the track state is up; if the return code is not OK, the track state is down. For reachability, if the return code is OK or OverThreshold, reachability is up; if not OK, reachability is down.”

    E.g Reference:
    https://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst3750x_3560x/software/release/12-2_55_se/configuration/guide/3750xscg/sweot.html

  37. CiscoGuy
    April 19th, 2018

    agree with renewer
    when tracking state only then only an OK means up anything else means down
    When tracking reachability then OK or overThreashold means up anything else means down

    https://www.cisco.com/c/en/us/td/docs/ios/ipsla/command/reference/sla_book/sla_05.html#wp1093733

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    May 30th, 2018

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  39. USrower
    June 3rd, 2018

    Q6 is wrong. According to Cisco’s website, the answer should be “A”.

    State = ok is up. all other return codes are down

    Reachability = ok or over threshold are up. all other return codes are down

    https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/ipapp/command/iap-cr-book/iap-t1.html#GUID-63B1F5E7-1963-4F87-B04A-1EA16A049B4A

    NOTE: I found that some of the composite quizzes have the correct answer.

  40. Brendan
    June 22nd, 2018

    Confirming the 539q dumps are valid.

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