Home > Articles > Certification > Cisco Certification > CCNP

  • Print
  • + Share This
This chapter is from the book

Foundation Summary

This section is a collection of information that provides a convenient review of many key concepts in this chapter. If you are already comfortable with the topics in this chapter, this summary can help you recall a few details. If you just read this chapter, this review should help solidify some key facts. If you are doing your final preparation before the exam, these tables are a convenient way to review the day before the exam.

Table 15-5 summarizes the various advanced queuing techniques discussed in this chapter.

Table 15-5 Queuing Summary

FIFO

Class-Based Weighted Fair

Low-Latency

No configuration

Define flows (class-map), policy per flow (policy-map), and assign to an interface (service-policy)

Same configuration as CBWFQ, but add a priority queue for delay-sensitive traffic

No priority traffic

Administrator-defined policies

High-priority traffic has its own priority queue—guarantee of service

Traffic dispatched on first-come, first-served basis

Traffic dispatched using WFQ between flows, FIFO within flows

Priority queue is sent first, then remaining queues are WFQ, with FIFO within a queue


Table 15-6 summarizes the various queuing commands discussed in this chapter.

Table 15-6 Queuing Command Summary

Command

Function

class-map { match-all | match-any } class-map-name

Creates a data structure to select specific traffic.

match-all is an AND of all conditions within the class-map.

match-any is an OR of the conditions within the class-map.

match

Matches specific traffic within a class-map (defined below).

access-group {number | name}

Matches a numbered or named IP access list.

any

Matches all traffic.

class-map class-map-name

Creates a nested class-map.

cos IP-TOS

Matches the IP ToS bits.

destination-address mac MAC-address

Matches a specific destination MAC address.

input-interface interface

Matches the interface the traffic arrived on.

ip {dscp value | precedence value | rtp start-port port-range}

Matches various IP header values.

mpls experimental value

Matches the MPLS experimental bits.

protocol value

Matches any given protocol.

qos-group value

Matches traffic from a specific QoS group.

source-address mac MAC-address

Matches a specific source MAC address.

policy-map policy-map-name

Creates a data structure to reference one or more class-maps and is assigned to an interface.

class class-map-name

Maps the class-map (defined earlier) to the policy-map. There are many parameters (below) to reference only specific traffic within the class map.

bandwidth {Kbps-value | percent value}

Defines how traffic is handled during congested situation (CBWFQ).

priority Kbps-value

Defines how traffic is handled at all times (LLQ).

queue-limit #-packets

Defines how many packets may reside in a particular queue.

service-policy policy-map-name

Creates nested policy maps.

shape {average bps-value | max-buffers buffer-value | peak bps-value}

Defines traffic shaping (buffering) parameters.

police bps-value

Defines traffic policing (discarding) parameters.

set {cos value | ip value | mpls experimental value | qos-group value}

Allows marking of various parameters.

service-policy { input | output } policy-map-name

Assigns a policy map to an interface. Packet queuing is normally done outbound.


Table 15-7 summarizes the various advanced queuing techniques discussed in this chapter.

Table 15-7 Compression Summary

Link

Stac

Predictor

Payload

TCP Header

Compresses OSI Layers 2–7

Very CPU intensive

Memory intensive

Compresses OSI Layers 3–7

Compresses OSI Layers 3–4

Two algorithms = Stac and Predictor

Replaces redundant strings with tokens

Replaces text with smaller codes

 

Compresses ONLY IP and TCP headers

 

Does not expand encrypted or compressed data (no redundant strings)

Could possibly expand compressed data

 

Good for very small data packets

 

Open standard

Cisco proprietary

Open standard

 

Used across point-to-point circuits only

Can be used on both PPP and HDLC links

Can be used on PPP links only

Can be used on HDLC, PPP, and Frame Relay links

Can be used on any links


  • + Share This
  • 🔖 Save To Your Account

InformIT Promotional Mailings & Special Offers

I would like to receive exclusive offers and hear about products from InformIT and its family of brands. I can unsubscribe at any time.

Overview


Pearson Education, Inc., 221 River Street, Hoboken, New Jersey 07030, (Pearson) presents this site to provide information about products and services that can be purchased through this site.

This privacy notice provides an overview of our commitment to privacy and describes how we collect, protect, use and share personal information collected through this site. Please note that other Pearson websites and online products and services have their own separate privacy policies.

Collection and Use of Information


To conduct business and deliver products and services, Pearson collects and uses personal information in several ways in connection with this site, including:

Questions and Inquiries

For inquiries and questions, we collect the inquiry or question, together with name, contact details (email address, phone number and mailing address) and any other additional information voluntarily submitted to us through a Contact Us form or an email. We use this information to address the inquiry and respond to the question.

Online Store

For orders and purchases placed through our online store on this site, we collect order details, name, institution name and address (if applicable), email address, phone number, shipping and billing addresses, credit/debit card information, shipping options and any instructions. We use this information to complete transactions, fulfill orders, communicate with individuals placing orders or visiting the online store, and for related purposes.

Surveys

Pearson may offer opportunities to provide feedback or participate in surveys, including surveys evaluating Pearson products, services or sites. Participation is voluntary. Pearson collects information requested in the survey questions and uses the information to evaluate, support, maintain and improve products, services or sites, develop new products and services, conduct educational research and for other purposes specified in the survey.

Contests and Drawings

Occasionally, we may sponsor a contest or drawing. Participation is optional. Pearson collects name, contact information and other information specified on the entry form for the contest or drawing to conduct the contest or drawing. Pearson may collect additional personal information from the winners of a contest or drawing in order to award the prize and for tax reporting purposes, as required by law.

Newsletters

If you have elected to receive email newsletters or promotional mailings and special offers but want to unsubscribe, simply email information@informit.com.

Service Announcements

On rare occasions it is necessary to send out a strictly service related announcement. For instance, if our service is temporarily suspended for maintenance we might send users an email. Generally, users may not opt-out of these communications, though they can deactivate their account information. However, these communications are not promotional in nature.

Customer Service

We communicate with users on a regular basis to provide requested services and in regard to issues relating to their account we reply via email or phone in accordance with the users' wishes when a user submits their information through our Contact Us form.

Other Collection and Use of Information


Application and System Logs

Pearson automatically collects log data to help ensure the delivery, availability and security of this site. Log data may include technical information about how a user or visitor connected to this site, such as browser type, type of computer/device, operating system, internet service provider and IP address. We use this information for support purposes and to monitor the health of the site, identify problems, improve service, detect unauthorized access and fraudulent activity, prevent and respond to security incidents and appropriately scale computing resources.

Web Analytics

Pearson may use third party web trend analytical services, including Google Analytics, to collect visitor information, such as IP addresses, browser types, referring pages, pages visited and time spent on a particular site. While these analytical services collect and report information on an anonymous basis, they may use cookies to gather web trend information. The information gathered may enable Pearson (but not the third party web trend services) to link information with application and system log data. Pearson uses this information for system administration and to identify problems, improve service, detect unauthorized access and fraudulent activity, prevent and respond to security incidents, appropriately scale computing resources and otherwise support and deliver this site and its services.

Cookies and Related Technologies

This site uses cookies and similar technologies to personalize content, measure traffic patterns, control security, track use and access of information on this site, and provide interest-based messages and advertising. Users can manage and block the use of cookies through their browser. Disabling or blocking certain cookies may limit the functionality of this site.

Do Not Track

This site currently does not respond to Do Not Track signals.

Security


Pearson uses appropriate physical, administrative and technical security measures to protect personal information from unauthorized access, use and disclosure.

Children


This site is not directed to children under the age of 13.

Marketing


Pearson may send or direct marketing communications to users, provided that

  • Pearson will not use personal information collected or processed as a K-12 school service provider for the purpose of directed or targeted advertising.
  • Such marketing is consistent with applicable law and Pearson's legal obligations.
  • Pearson will not knowingly direct or send marketing communications to an individual who has expressed a preference not to receive marketing.
  • Where required by applicable law, express or implied consent to marketing exists and has not been withdrawn.

Pearson may provide personal information to a third party service provider on a restricted basis to provide marketing solely on behalf of Pearson or an affiliate or customer for whom Pearson is a service provider. Marketing preferences may be changed at any time.

Correcting/Updating Personal Information


If a user's personally identifiable information changes (such as your postal address or email address), we provide a way to correct or update that user's personal data provided to us. This can be done on the Account page. If a user no longer desires our service and desires to delete his or her account, please contact us at customer-service@informit.com and we will process the deletion of a user's account.

Choice/Opt-out


Users can always make an informed choice as to whether they should proceed with certain services offered by InformIT. If you choose to remove yourself from our mailing list(s) simply visit the following page and uncheck any communication you no longer want to receive: www.informit.com/u.aspx.

Sale of Personal Information


Pearson does not rent or sell personal information in exchange for any payment of money.

While Pearson does not sell personal information, as defined in Nevada law, Nevada residents may email a request for no sale of their personal information to NevadaDesignatedRequest@pearson.com.

Supplemental Privacy Statement for California Residents


California residents should read our Supplemental privacy statement for California residents in conjunction with this Privacy Notice. The Supplemental privacy statement for California residents explains Pearson's commitment to comply with California law and applies to personal information of California residents collected in connection with this site and the Services.

Sharing and Disclosure


Pearson may disclose personal information, as follows:

  • As required by law.
  • With the consent of the individual (or their parent, if the individual is a minor)
  • In response to a subpoena, court order or legal process, to the extent permitted or required by law
  • To protect the security and safety of individuals, data, assets and systems, consistent with applicable law
  • In connection the sale, joint venture or other transfer of some or all of its company or assets, subject to the provisions of this Privacy Notice
  • To investigate or address actual or suspected fraud or other illegal activities
  • To exercise its legal rights, including enforcement of the Terms of Use for this site or another contract
  • To affiliated Pearson companies and other companies and organizations who perform work for Pearson and are obligated to protect the privacy of personal information consistent with this Privacy Notice
  • To a school, organization, company or government agency, where Pearson collects or processes the personal information in a school setting or on behalf of such organization, company or government agency.

Links


This web site contains links to other sites. Please be aware that we are not responsible for the privacy practices of such other sites. We encourage our users to be aware when they leave our site and to read the privacy statements of each and every web site that collects Personal Information. This privacy statement applies solely to information collected by this web site.

Requests and Contact


Please contact us about this Privacy Notice or if you have any requests or questions relating to the privacy of your personal information.

Changes to this Privacy Notice


We may revise this Privacy Notice through an updated posting. We will identify the effective date of the revision in the posting. Often, updates are made to provide greater clarity or to comply with changes in regulatory requirements. If the updates involve material changes to the collection, protection, use or disclosure of Personal Information, Pearson will provide notice of the change through a conspicuous notice on this site or other appropriate way. Continued use of the site after the effective date of a posted revision evidences acceptance. Please contact us if you have questions or concerns about the Privacy Notice or any objection to any revisions.

Last Update: November 17, 2020