ITT Tech

NT 1210

Chapter 9

1)IP hosts in two different company TCP/IP networks send IP packets to each other through the Internet. Which of the following is true about the Internet connections that must exist so that the packets can flow between the two companies? a. The two companies must connect directly to each other. b. The two companies must each have at least one Internet access link. c. The two companies must connect to the same ISP. d. The two companies must each connect to a Tier 1 ISP.

2. Which of the following standalone devices can be found near the Internet edge, with a primary purpose of providing some type of network security between an enterprise or SOHO TCP/IP network and the Internet? (Choose two answers.) a. LAN access point b. IPS c. Analog modem d. Firewall

3. Which of the following answers list a concept that is likely to be true about a single POP? (Choose two answers.) a. It is located near ISP customers. b. It contains many routers that work independently, without network connections to the other routers. c. It holds routers from multiple ISPs, allowing high-speed but inexpensive interconnects between ISPs. d. It connects to other ISP sites using some kind of WAN links.
4. Which of the following answers lists a fact that is true about a Tier 1 ISP, but not true about a Tier 2 ISP? a. Must have at least one network link to every other Tier 1 and Tier 2 ISP b. Has a network link to at least one other ISP c. Typically has many redundant high-speed links to other ISPs d. Most often, connects just to ISPs in the other tier
5. An enterprise network engineer wants to create a website for his company, Ent-1, with host name www.ent-1.com. Which of the following answers best describe a common place where the computer hardware for this website can be located? (Choose two answers.) a. In the Internet b. In

the Ent-1 enterprise TCP/IP network c. At a web-hosting service d. In the IPS at the enterprise’s Internet edge

6. A user has a PC and an analog modem. The user dials into her ISP, connects to the Internet, and surfs the web. The user then wants to make a phone call using her home telephone and the same telephone line. Which of the following answers is true in this case? a. The user must hang up the call to the ISP, and not surf, while talking on the phone. b. The call works, but the bit rate of the Internet connection reduces by 64 Kbps for the duration of the call. c. The call works, but the user can only send data when she is not talking, and receive data when the other person is not talking. d. The call works, with no change to the data speeds whether the voice call is happening or not.
7. A user migrates from using analog modems for Internet access to using DSL. The user sets up the DSL connection, using a PC, an Ethernet cable, an external DSL modem, and a phone line. The connection works, and the user surfs the web. The user also connects an analog home phone to another phone extension; the user then wants to make a phone call using his home telephone and the same telephone line used by DSL. Which of the following answers is true in this case? a. The user must hang up the call to the ISP, and not surf, while talking on the phone. b. The call works,

but the bit rate of the Internet connection reduces by 64 Kbps for the duration of the call. c. The call works, but the user can only send data when he is not talking, and receive data when the other person is not talking. d. The call works, with no change to the data speeds whether the voice call is happening or not.

8. A user has lived at the same house for the last 30 years, using home phone services from the same local phone company. The user then calls an ISP and registers for DSL service to the home. The new customer is impatient, but the customer service rep tells the customer it will take a few days because a technician has do some work. Which one of the following answers is the most likely reason for the additional time required to install DSL service? a. The technician needs to connect the CO end of the local loop to a router. b. The technician needs to connect the CO end of the local loop to a CMTS. c. The technician needs to install HFC cabling. d. None of the answers is correct.
9. A user asks the cable company to install cable Internet service. The deal includes having a technician come and install all the equipment in the home. The equipment includes a consumer-grade router that performs several functions and an external cable modem. The cable company has equipment in its local head end offices as well. Which of the following devices, or functions inside the integrated router, plays a role in separating the data signals on the HFC cabling from the video signals? a. The router’s firewall function b. The router’s NAT function c. A cable modem d. The DSLAM at the head end

10. Which of the following Internet access technologies create an always- on Internet service, allow voice calls on the local telco’s local loop while the Internet service still works, and use asymmetric speeds? (Choose two answers.) a. Cable Internet b. ADSL c. Analog modems d. T1
11. Imagine the early days of the Internet, before CIDR. A company wants to connect to the Internet, so it asks IANA or an associated RIR to assign the company some public IP addresses. Which of the following lists an approximate number of IP addresses that IANA or the RIR could possibly assign? (You can ignore rounding issues and the need to reserve any special cases.) a. 256 b. 1024 c. 8192 d. 32,768
12. Imagine the early days of the Internet, before CIDR. A home user had one PC in the home, and she used an analog modem to access an ISP. Before she could send any packets into the public Internet, which of the following did the user have to do for her PC to have a public, globally unique IP address that allowed the PC to send and receive packets in the Internet? a. Register a class C network with IANA (or a related agency). b. Choose a private IP network and use NAT. c. No action is required, because the PC did not use TCP/IP. d. No action is required, because the ISP dynamically assigned a temporary public IP address to the PC.

13. Two Tier 1 ISPs use a dynamic IP routing protocol to exchange routing information about routes for their respective customers. Which of the following is the most likely routing protocol to be used in this case? a. BGP

b. PPP c. NAT d. OSPF

14. A SOHO user connects a small office to the Internet using a cable modem. The small office has five PCs that connect to the consumer-grade router, which connects to a cable modem, which in turn connects to the cable company’s coaxial cable. Call the five PCs PC A, B, C, D, and E, and the router R1. Which of the following answers is true about the routes used by the PCs and router for sending packets into the Internet? a. A’s default router lists an IP address of one of the cable company’s routers at the cable company head end. b. B’s default router lists an IP address on R1. c. R1’s default router entry lists an IP address of one of the cable company’s routers at the cable company head end. d. R1 runs BGP to learn routes from a router in the cable company head end.

15. A company, Ent-1, uses the following URL to identify its public web server: www.ent-1.com. Ent-1 hosts its web server on a server inside the company’s TCP/IP network, and with the company’s own DNS server as the authoritative DNS server for this host name. A client in another part of the Internet opens a web browser and types in the www.ent-1.com name. Which of following must be true for the client to successfully learn the IP address used by host name www.ent-1.com? a. The client must know the IP address of the Ent-1 DNS server. b. The client must know the IP address of a .com root DNS server. c. The client must know the IP address of a DNS server that can in turn ask other DNS servers. d. The client must have a local file that lists this host name and its matching IP address.
16. Imagine the later days of the Internet, with CIDR. A company wants to connect to the Internet, so it asks IANA, an associated RIR, or an ISP to assign the company some public IP addresses. Which of the following list an approximate number of IP addresses IANA or the RIR could possibly assign? (You can ignore rounding issues and the need to reserve any special cases.) (Choose three answers.) a. 256 b. 1024 c. 8192 d. 24,768
17. Which of the following are features defined by CIDR? (Choose two answers.) a. Public address assignment rules based on blocks of several sizes, based on powers of 2 b. Host names that use a registered subdomain as the last part of the name, helping to create unique names