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51.
Which of the following describes the creation of private networks across the Internet, enabling privacy and tunneling of non-TCP/IP protocols?
  • A.
    HDLC
  • C.
    VPN
  • E.
    xDSL
  • B.
    Cable
  • D.
    IPSec
  • Answer & Explanation
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Answer : [C]
Explanation :
A allows the creation of private networks across the Internet, enabling privacy and tunneling of non-TCP/IP protocols. A VPN can be set up across any type of link.
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52.
Which of the following describes an industry-wide standard suite of protocols and algorithms that allows for secure data transmission over an IP-based network that functions at the layer 3 Network layer of the OSI model?
  • A.
    HDLC
  • C.
    VPN
  • E.
    xDSL
  • B.
    Cable
  • D.
    IPSec
  • Answer & Explanation
  • Report
Answer : [D]
Explanation :
IPSec is an industry-wide standard suite of protocols and algorithms that allows for secure data transmission over an IP-based network that functions at the layer 3 Network layer of the OSI model.
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53.
A remote site has just been connected to the central office. However, remote users cannot access applications at the central office. The remote router can be pinged from the central office router. After reviewing the command output shown below, which do you think is the most likely reason for the problem?
Central#show running-config
!
interface Serial0
ip address 10.0.8.1 255.255.248.0
encapsulation frame-relay
frame-relay map ip 10.0.15.2 200
!
Router rip
Network 10.0.0.0
Remote#show running-config
!
interface Serial0
ip address 10.0.15.2 255.255.248.0
encapsulation frame-relay
frame-relay map ip 10.0.8.1 100
!
Router rip
Network 10.0.0.0

  • A.
    The Frame Relay PVC is down.
  • B.
    The IP addressing on the Central/Remote router link is incorrect.
  • C.
    RIP routing information is not being forwarded.
  • D.
    Frame Relay Inverse ARP is not properly configured.
  • Answer & Explanation
  • Report
Answer : [C]
Explanation :
Even though the IP addresses don't look correct, they are in the same subnet, so answer B is not correct. The question states that you can ping the other side, so the PVC must be up— answer A can't be correct. You cannot configure IARP, so only answer C can be correct. Since a Frame Relay network is a non-broadcast multi-access network by default, broadcasts such as RIP updates cannot be sent across the PVC unless you use the broadcast statement at the end of the frame-relay map command.
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54.
Why won't the serial link between the Corp router and the Remote router come up?
 
Corp#sh int s0/0
Serial0/0 is up, line protocol is down
Hardware is PowerQUICC Serial
Internet address is 10.0.1.1/24
MTU 1500 bytes, BW 1544 Kbit, DLY 20000 usec,
reliability 254/255, txload 1/255, rxload 1/255

Remote#sh int s0/0
Serial0/0 is up, line protocol is down
Hardware is PowerQUICC Serial
Internet address is 10.0.1.2/24
MTU 1500 bytes, BW 1544 Kbit, DLY 20000 usec,
reliability 254/255, txload 1/255, rxload 1/255
Encapsulation HDLC, loopback not set
                        
 
  • A.
    The serial cable is faulty.
  • B.
    The IP addresses are not in the same subnet.
  • C.
    The subnet masks are not correct.
  • D.
    The keepalive settings are not correct.
  • E.
    The layer 2 frame types are not compatible.
  • Answer & Explanation
  • Report
Answer : [E]
Explanation :
This is an easy question because the Remote router is using the default HDLC serial encapsulation and the Corp router is using the PPP serial encapsulation. You should go to the Remote router and set that encapsulation to PPP or change the Corp router back to the default of HDLC.
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55.
In which of the following technologies is the term HFC used?
  • A.
    DSL
  • B.
    Frame Relay
  • E.
    Wireless
  • C.
    PPPoE
  • D.
    Cable
  • F.
    POTS
  • Answer & Explanation
  • Report
Answer : [D]
Explanation :
In a modern network, hybrid fibre-coaxial (HFC) is a telecommunications industry term for a network that incorporates both optical fiber and coaxial cable to create a broadband network.
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