Home > Articles > Cisco > CCIE

CCIE Routing and Switching v5.0 Official Cert Guide: IP Forwarding (Routing)

📄 Contents

  1. "Do I Know This Already?" Quiz
  2. Foundation Topics
  3. Foundation Summary
This chapter from CCIE Routing and Switching v5.0 Official Cert Guide, Volume 1, 5th Edition covers Cisco Express Forwarding concepts, routing protocol migration, and policy-based routing.
This chapter is from the book

Blueprint topics covered in this chapter:

This chapter covers the following subtopics from the Cisco CCIE Routing and Switching written exam blueprint. Refer to the full blueprint in Table I-1 in the Introduction for more details on the topics covered in each chapter and their context within the blueprint.

  • Cisco Express Forwarding Concepts
  • Routing Protocol Migration
  • Policy-Based Routing

This chapter begins with coverage of the details of the forwarding plane—the actual forwarding of IP packets. This process of forwarding IP packets is often called IP routing, or simply routing. Also, many people also refer to IP routing as the data plane, meaning the plane (topic) related to the end-user data.

Chapters 7 through 11 cover the details of the IP control plane. In contrast to the term data plane, the control plane relates to the communication of control information—in short, routing protocols like OSPF and BGP. These chapters cover the routing protocols on the exam, plus an additional chapter on redistribution and route summarization.

“Do I Know This Already?” Quiz

Table 6-1 outlines the major headings in this chapter and the corresponding “Do I Know This Already?” quiz questions.

Table 6-1 “Do I Know This Already?” Foundation Topics Section-to-Question Mapping

Foundation Topics Section

Questions Covered in This Section

Score

IP Forwarding

1–6

 

Multilayer Switching

7–9

 

Policy Routing

10–11

 

Total Score

To best use this pre-chapter assessment, remember to score yourself strictly. You can find the answers in Appendix A, “Answers to the ‘Do I Know This Already?’ Quizzes.”

  1. What command is used to enable CEF globally for IPv4 packets?

    1. enable cef
    2. ip enable cef
    3. ip cef
    4. cef enable
    5. cef enable ip
    6. cef ip
  2. What command is used to enable CEF globally for IPv6 packets?

    1. enable cef6
    2. ipv6 enable cef
    3. ipv6 cef
    4. ip cef (the command automatically enables CEF for IPv4 and IPv6)
  3. Can CEF for IPv6 be enabled independently of CEF for IPv4?

    1. Yes
    2. No
  4. Which of the following triggers an update to a CEF FIB?

    1. Receipt of an ICMPv6 Neighbor Advertisement message with previously unknown information
    2. Receipt of a LAN ARP reply message with previously unknown information
    3. Addition of a new route to the IP routing table by EIGRP
    4. Addition of a new route to the IP routing table by adding an ip route command
    5. The removal of a route from the IP routing table by EIGRP
  5. Which of the following triggers an update to a CEF adjacency table?

    1. Receipt of a CDP multicast on the PVC connected to Router1
    2. Receipt of an ARP response with previously unknown information
    3. Receipt of a packet that needs to be routed to another router over a point-to-point interface
    4. Receipt of an ICMPv6 Neighbor Advertisement with previously unknown information
  6. Which of the following packet-switching paths is considered to be the slowest?

    1. Process Switching
    2. Fast Switching
    3. Route Cache
    4. Cisco Express Forwarding
  7. Which of the following commands is used on a Cisco IOS Layer 3 switch to use the interface as a routed interface instead of a switched interface?

    1. ip routing or ipv6 unicast-routing global command
    2. ip routing or ipv6 unicast-routing interface subcommand
    3. ip address interface subcommand
    4. switchport mode routed interface subcommand
    5. no switchport interface subcommand
  8. On a Cisco Catalyst 3560 switch, the first line of the output of a show interface vlan 55 command lists the state as “Vlan 55 is down, line protocol is down.” Which of the following might be causing that state to occur?

    1. VLAN interface has not been no shut yet.
    2. The ip routing global command is missing from the configuration.
    3. On at least one interface in the VLAN, a cable that was previously plugged in has been unplugged.
    4. VTP mode is set to transparent.
    5. The VLAN has not yet been created on this switch, or is not in the active state.
  9. On a Cisco Catalyst 3560 switch, the first line of the output of a show interface vlan 55 command lists the state as “Vlan 55 is up, line protocol is down.” Which of the following might be causing that state to occur?

    1. VLAN interface has not been no shut yet.
    2. The ip routing global command is missing from the configuration.
    3. There is no switch port on the switch with this VLAN allowed and in the STP forwarding state.
    4. STP has been administratively deactivated for this VLAN.
    5. The VLAN has not yet been created on this switch, or is not in the active state.
  10. Imagine a route map used for policy routing, in which the route map has a set default interface serial0/0 command. Serial0/0 is a point-to-point link to another router. A packet arrives at this router, and the packet matches the policy routing route-map clause whose only set command is the one just mentioned. Which of the following general characterizations is true?

    1. The packet will be routed out interface s0/0; if s0/0 is down, it will be routed using the default route from the routing table.
    2. The packet will be routed using the default route in the routing table; if there is no default, the packet will be routed out s0/0.
    3. The packet will be routed using the best match of the destination address with the routing table; if no match is found, the packet will be routed out s0/0.
    4. The packet will be routed out interface s0/0; if s0/0 is down, the packet will be discarded.
  11. Router1 has an fa0/0 interface and two point-to-point WAN links back to the core of the network (s0/0 and s0/1, respectively). Router1 accepts routing information only over s0/0, which Router1 uses as its primary link. When s0/0 fails, Router1 uses policy routing to forward the traffic out the relatively slower s0/1 link. Which of the following set commands in Router1’s policy routing route map could have been used to achieve this function?

    1. set ip default next-hop
    2. set ip next-hop
    3. set default interface
    4. set interface

Pearson IT Certification Promotional Mailings & Special Offers

I would like to receive exclusive offers and hear about products from Pearson IT Certification 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 Pearson IT Certification 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 Adobe Press. 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.pearsonitcertification.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