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352-001 · Question #361

You must measure the amount of traffic that a mobile packet gateway produces when mobile phones access the service provider's internal applications, rather than the Internet. Backbone queuing can be p

The correct answer is B. Collect traffic information that is related to internal server IP addresses with NetFlow. D. Collect information about traffic to the service provider marked with IP precedence with NetFlow. E. Analyze traffic volumes with deep packet inspection.. Measuring multi-Gbps internal application traffic at a mobile packet gateway requires NetFlow for flow-level accounting and DPI for application-layer traffic classification.

Designing Management and Operations

Question

You must measure the amount of traffic that a mobile packet gateway produces when mobile phones access the service provider's internal applications, rather than the Internet. Backbone queuing can be properly designed as a result of this analysis. This traffic is in the multiple Gigabits per second order of magnitude. Which three actions can you take to allow this visibility? (Choose three.)

Options

  • APoll OID that is configured for internal servers with SNMP.
  • BCollect traffic information that is related to internal server IP addresses with NetFlow.
  • CMeasure traffic characteristics of known internal servers with IP SLA.
  • DCollect information about traffic to the service provider marked with IP precedence with NetFlow.
  • EAnalyze traffic volumes with deep packet inspection.

How the community answered

(27 responses)
  • A
    7% (2)
  • B
    74% (20)
  • C
    19% (5)

Why each option

Measuring multi-Gbps internal application traffic at a mobile packet gateway requires NetFlow for flow-level accounting and DPI for application-layer traffic classification.

APoll OID that is configured for internal servers with SNMP.

SNMP OID polling measures interface-level counters or device MIB values aggregated at polling intervals and cannot provide the per-flow, per-destination granularity needed to isolate traffic to specific internal servers at multi-Gbps scale.

BCollect traffic information that is related to internal server IP addresses with NetFlow.Correct

NetFlow configured with export filters or flow samplers targeting known internal server IP address ranges collects per-flow records including source, destination, byte count, and protocol, providing the granular accounting needed to characterize traffic volumes to specific internal applications at Gbps scale.

CMeasure traffic characteristics of known internal servers with IP SLA.

IP SLA generates synthetic test probes to measure performance metrics such as delay and jitter for specific known servers but does not measure the volume or characteristics of actual subscriber traffic flowing through the gateway.

DCollect information about traffic to the service provider marked with IP precedence with NetFlow.Correct

NetFlow collection policies scoped to specific IP precedence or DSCP values that the SP applies to internally-destined traffic enable precise segmentation of internal application flows from internet-bound traffic. This approach leverages existing traffic marking schemes already deployed in the SP backbone to distinguish traffic classes without additional probes.

EAnalyze traffic volumes with deep packet inspection.Correct

Deep packet inspection (DPI) examines packet content beyond the IP and transport headers to identify application type, destination, and flow characteristics. At a mobile packet gateway, DPI can distinguish traffic destined for internal SP applications from internet traffic based on payload signatures or protocol behavior, providing the application-layer visibility that flow-based tools alone cannot supply.

Concept tested: NetFlow and DPI for internal application traffic measurement

Source: https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/netflow/configuration/xe-16/ios-xe-16-netflow-book/ios-xe-16-netflow-book.html

Topics

#NetFlow#traffic measurement#DPI#mobile packet gateway

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