ch16-1 Which of the following best describes the function of demodulation by a modem?
(A) Encoding an incoming analog signal from the PC as a digital signal for transmis- sion into the PSTN
(B) Decoding an incoming digital signal from the PSTN into an analog signal
(C) Encoding a set of binary digits as an analog electrical signal
(D) Decoding an incoming analog electrical signal from the PSTN into a digital signal e. Encoding a set of binary digits as a digital electrical signal

ch16-2 Which of the following standards has a limit of 18,000 feet for the length of the local loop?(A) ADSL(B) Analog modems(C) ISDN(D) Cable Internet service

ch16-3 Which of the following is true regarding the location and purpose of a DSLAM?(A) Typically used at a home or small office to connect the phone line to a DSL router(B) Typically used at a home or small office instead of a DSL router(C) Typically used inside the telco’s CO to prevent any voice traffic from reaching the ISP’s router(D) Typically used inside the telco’s CO to separate the voice traffic from the data traffic

複選題ch16-4 Which of the following remote-access technologies support specifications that allow both symmetric speeds and asymmetric speeds? (A) Analog modems(B) WWW(C) DSL(D) Cable modems

複選題ch16-5 Which of the following remote-access technologies, when used to connect to an ISP, is considered to be an “always on” Internet service? (A) Analog modems(B) DSL(C) Cable modems(D) All of these answers are correct.

ch16-6 For a typical Internet access router, using either cable or DSL, which of the following does the router typically do on the router interface connected to the LAN with the PCs in the small or home office? (A) Acts as a DHCP server(B) Acts as a DHCP client(C) Performs NAT/PAT for the source address of packets that exit the interface(D) Acts as DNS server

複選題ch16-7 For a typical Internet access router, using either cable or DSL, which of the following does the router typically do on the router interface connected toward the Internet?(A) Acts as a DHCP server(B) Acts as a DHCP client(C) Performs NAT/PAT for the source address of packets that exit the interface(D) Acts as DNS server

複選題ch16-8 This question examines a home-based network with a PC, a DSL router, and a DSL line. The DSL router uses typical default settings and functions. The PC connected to the router has IP address 10.1.1.1. This PC opens a browser and connects to the www.cisco.com web server. Which of the following are true in this case?(A) The web server can tell it is communicating with a host at IP address 10.1.1.1.(B) The PC learns the IP address of the www.cisco.com web server as a public IP address.(C) The 10.1.1.1 address would be considered an inside local IP address. (D) The 10.1.1.1 address would be considered an inside global IP address.

ch17-1 Routers R1 and R2 connect using a leased line, with both routers using their respective Serial 0/0 interfaces. The routers can currently route packets over the link, which uses HDLC Which of the following commands would be required to migrate the configuration to use PPP? (A) encapsulation ppp(B) no encapsulation hdlc(C) clock rate 128000(D) bandwidth 128000

ch17-2 Routers R1 and R2 have just been installed in a new lab. The routers will connect using a back-to-back serial link, using interface serial 0/0 on each router. Which of the following is true about how to install and configure this connection? (A) If the DCE cable is installed in R1, the clock rate command must be configured on R2’s serial interface.(B) If the DTE cable is installed in R1, the clock rate command must be configured on R2’s serial interface.(C) If the clock rate 128000 command is configured on R1, the bandwidth 128 command must be configured on R2.(D) None of the answers are correct.

ch17-3 Two brand new Cisco routers have been ordered and installed in two different sites, 100 miles apart. A 768-kbps leased line has been installed between the two routers. Which of the following commands is required on at least one of the routers in order to forward packets over the leased line, using PPP as the data link protocol? (A) no encapsulation hdlc(B) encapsulation ppp(C) clock rate 768000(D) bandwidth 768 e. description this is the link

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