Ccna certification Practice Tests

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Appendix 

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  Answers to Practice Test Questions

 48.  B.  The most common hub-and-spoke WAN design is the way an Internet service provider 

(ISP) is connected to its customers. The Internet connection is centrally located in a 

common physical location of the Internet provider called the point of presence or meet-me 

room. All lines connect out from this point in a hub-and-spoke design. Connections 

for an enterprise spread over a metropolitan area can connect in a number of different 

topologies, depending on what is available. Connections between two or more corporate 

locations are often a point-to-point or point-to-multipoint topology. An internal 

connection inside of a service provider’s network can be made a number of different ways 

using several different topologies.

 49.  C.  The Cisco Dynamic Multipoint Virtual Private Network (DMVPN) is always 

configured in a hub-and-spoke topology. The central router creates a multiport GRE 

connection between all of the branch routers. IPsec uses a point-to-point topology for 

connectivity. MPLS and Metro Ethernet use a point-to-point or point-to-multipoint 

topology for connectivity.

 50.  C.  The Link Control Protocol (LCP) provides the authentication phase of a PPP 

connection. Multiprotocol Label Switching (MPLS) is a WAN connectivity protocol and 

connection method. The Network Control Protocol (NCP) allows for multiple upper-layer 

protocols to be used with PPP. There is no protocol called ACP; therefore, it is an invalid 

answer.

 51.  B.  The High-Level Data Link Control (HDLC) protocol is used as the encapsulation 

method for serial links. This protocol is the open standard HDLC compared to the native 

Cisco proprietary version. The Point-to-Point Protocol over Ethernet (PPoE) is widely 

used with digital subscriber lines (DSLs) and WiMax wireless services. Multiprotocol 

Label Switching is a WAN connectivity method. X.25 is a legacy WAN protocol used to 

transmit data.

 52.  C.  The Challenge Handshake Authentication Protocol (CHAP) works by sending a 

random number called the challenge. This challenge is received by the authenticating 

router and used to hash the password. The password is transferred to the challenging 

router and authenticates the authenticating router. The Password Authentication Protocol 

transmits the username and password in clear text. There is no protocol called PSAP; 

therefore, it is an invalid answer. The Lightweight Directory Access Protocol is a protocol 

used to look up data, and it is used primarily with Active Directory. It does not provide 

encryption by itself but can be used with SSL to provide encryption.

 53.  C.  The Link Control Protocol (LCP) provides the facility for multilink connections. 

Multiprotocol Label Switching (MPLS) is a WAN connectivity protocol and connection 

method. The Network Control Protocol (NCP) allows for multiple upper-layer protocols 

to be used with PPP. There is no protocol called ACP; therefore, it is an invalid answer.

 54.  A.  MultiLink PPP simplifies layer 3 configuration. It does this by bundling the 

connections together at layer 2. It provides a pseudo interface representing the individual 

interface where all layer 3 configuration is applied. You can use routing protocols with 

MLPPP, and in larger networks, it is recommended and required. MLPPP should be used 

with authentication protocols to authenticate the incoming connections. The MLPPP 

protocol does not provide end-to-end encryption.

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Chapter 1: Network Fundamentals (Domain 1)