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IP SLA Questions

August 15th, 2015 in ROUTE 300-101 Go to comments

Question 1

Question 2


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
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
//Configure PBR policing on the router
route-map PBR
match ip address ACL
set ip next-hop verify-availability track 1
set ip next-hop verify-availability 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
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


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

Question 4


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


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

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    April 8th, 2016

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    May 28th, 2016

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    October 1st, 2016

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    November 3rd, 2016

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  16. 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?

  17. 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?

  18. 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 for icmp-echod.

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