Home > Articles > Networking

Cisco Networking Academy Connecting Networks Companion Guide: Point-to-Point Connections

May 8, 2014

📄 Contents

␡

⎙ Print

< Back Page 10 of 10

This chapter is from the book 

Connecting Networks Companion Guide

Learn More Buy

Check Your Understanding Questions

Complete all the review questions listed here to test your understanding of the topics and concepts in this chapter. The appendix, “Answers to the ‘Check Your Understanding’ Questions,” lists the answers.

Match each PPP establishment step with its appropriate sequence number:

Step 1:

Step 2:

Step 3:

Step 4:

Step 5:
1. Test link quality (optional).
2. Negotiate Layer 3 protocol options.
3. Send link-establishment frames to negotiate options such as MTU size, compression, and authentication.
4. Send configuration-acknowledgment frames.
5. NCP reaches Open state.
Which output from the show interfaces s0/0/0 command indicates that the far end of a point-to-point link has a different encapsulation set than the local router?
1. Serial 0/0/0 is down, line protocol is down.
2. Serial 0/0/0 is up, line protocol is down.
3. Serial 0/0/0 is up, line protocol is up (looped).
4. Serial 0/0/0 is up, line protocol is down (disabled).
5. Serial 0/0/0 is administratively down, line protocol is down.
What is the default encapsulation for serial interfaces on a Cisco router?
1. HDLC
2. PPP
3. Frame Relay
4. X.25
What is the function of the Protocol field in a PPP frame?
1. It identifies the application layer protocol that will process the frame.
2. It identifies the transport layer protocol that will process the frame.
3. It identifies the data link layer protocol encapsulation in the frame’s Data field.
4. It identifies the network layer protocol encapsulated in the frame’s Data field.
Match each description with its corresponding term:

Error control:

Authentication protocols:

Allows load balancing:

Compression protocols:
1. Stacker/predictor
2. Magic number
3. Multilink
4. CHAP/PAP
5. Call in
Which of the following statements describe the function of statistical time-division multiplexing (STDM)? (Choose three.)
1. Multiple data streams share one common channel.
2. Bit interleaving controls the timing mechanism that places data on the channel.
3. Time slots are used on a first-come, first-served basis.
4. STDM was developed to overcome the inefficiency caused by time slots still being allocated even when the channel has no data to transmit.
5. Sources of data alternate during transmission and are reconstructed at the receiving end.
6. Priority can be dedicated to one data source.
Which of the following describes the serial connection between two routers using the High-level Data Link Control (HDLC) protocol?
1. Synchronous or asynchronous bit-oriented transmissions using a universal frame format
2. Synchronous bit-oriented transmissions using a frame format that allows flow control and error detection
3. Asynchronous bit-oriented transmissions using a frame format derived from the Synchronous Data Link Control (SDLC) protocol
4. Asynchronous bit-oriented transmissions using a V.35 DTE/DCE interface
If an authentication protocol is configured for PPP operation, when is the client or user workstation authenticated?
1. Before link establishment
2. During the link establishment phase
3. Before the network layer protocol configuration begins
4. After the network layer protocol configuration has ended
Why are Network Control Protocols used in PPP?
1. To establish and terminate data links
2. To provide authentication capabilities to PPP
3. To manage network congestion and to allow quality testing of the link
4. To allow multiple Layer 3 protocols to operate over the same physical link
Which statement describes the PAP authentication protocol?
1. It sends encrypted passwords by default.
2. It uses a two-way handshake to establish identity.
3. It protects against repeated trial-and-error attacks.
4. It requires the same username to be configured on every router.
A technician testing the functionality of a recently installed router is unable to ping the serial interface of a remote router. The technician executes the show interfaces serial 0/0/0 command on the local router and sees the following line in the router:

Serial0/0/0 is down, line protocol is down

What are two possible causes of this command output?
1. The clock rate command is missing.
2. The carrier detect signal is not sensed.
3. Keepalives are not being sent.
4. The interface is disabled due to a high error rate.
5. The interface is shut down.
6. The cabling is faulty or incorrect.
The network administrator is configuring Router1 to connect to Router2 using three-way handshake authentication. Match each description with the command necessary to configure Router1:

Configure the username and password:

Enter interface configuration mode:

Specify the encapsulation type:

Configure authentication:
1. username Router2 password cisco
2. username Router1 password cisco
3. interface serial 0/1/0
4. encapsulation ppp
5. encapsulation hdlc
6. ppp authentication pap
7. ppp authentication chap
What is required to successfully establish a connection between two routers using CHAP authentication?
1. The hostnames of both routers must be the same.
2. The usernames of both routers must be the same.
3. The enable secret passwords configured on both routers must be the same.
4. The password configured with the router’s username must be the same on both routers.
5. The ppp chap sent-username command must be configured the same on both routers.
For each characteristic, indicate whether it is associated with PAP or CHAP:

Two-way handshake:

Three-way handshake:

Open to trial-and-error attacks:

Password sent in cleartext:

Periodic verification:

Uses a one-way hash function:
For each description, indicate whether it is associated with LCP or NCP:

Negotiates link establishment parameters:

Negotiates Layer 3 protocol parameters:

Maintains/debugs a link:

Can negotiate multiple Layer 3 protocols:

Terminates a link:
Describe the functions of LCP and NCP.
Describe the five configurable LCP encapsulation options.

Refer to the following configurations for Router R1 and Router R3:

hostname R1,

username R1 password cisco123

!

int serial 0/0

ip address 128.0.1.1 255.255.255.0

encapsulation ppp

ppp authentication pap

-----------------------------

hostname R3

username R1 password cisco

!

int serial 0/0

ip address 128.0.1.2 255.255.255.0

encapsulation ppp

ppp authentication CHAP

Router R1 is unable to connect with Router R3. On the basis of the information presented, which configuration changes on Router R1 would correct the problem?

< Back Page 10 of 10

🔖 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.

Privacy Notice

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

Email Address