Multiple Choice Questions Essay

1. Which of the following is true about a TCP/IP network? The network uses standards defined in TCP/IP RFC’s plus other standards. 2. Which of the following terms is not a common synonym for TCP/IP model? Ethernet / TCP/IP Mapping 3. Think generically about the idea of a networking standard, ignoring any particular standard or standards group. Which of the following is typically true of a standard? It exists as a written document / it has been passed through some form of review and approval or certification process 4. Contrast an international standard as compared to a de facto standard? De facto standard documents have been reviewed more thoroughly. / De Facto standards typically mean that the standards group has been authorized by many countries to create standards that apply to multiple countries 5. Which of the following are true about the commonly used version of the TCP/IP model as shown in this chapter? The data link layer sits lower in the model than the transport layer. / The physical layer sits just below the data link layer 6. The TCP/IP model refers to standards other than those the IETF defines in RFC’s. Which of these standards groups is typically the source of external LAN standards? IEEE / ANSI 7. Which of the following is not a typical reason for a group of ten companies to start a vendor group, for the purpose of pushing a new networking technology? To keep intellectual property rights to the technology inside the company 8. The TCP/IP and OSI models have some obvious differences, like the number of layers. Think about the more commonly used version of the TCP/IP model discussed in this chapter, and then think about how to talk about TCP/IP using OSI terms. Which of the following is a correctly phrased statement for  how to use OSI terminology? IP is a network layer protocol 9. Historically, which of the following models were the earliest models used in corporate networks? TCP/IP 10. Which of the following statements is true when comparing the OSI and the TCP/IP model as defined in RFC 1122? 11. A network engineer connects two PCs (PC1 and PC2) using Ethernet NICs and an Ethernet cable that has copper wires inside. The two PCs communicate successfully. Which of the following happens when PC1 sends bits to PC2? 12. A TCP/IP network includes an Ethernet LAN with 10 PCs uses a LAN switch. PC1 sends data intended for an app running on PC2. Which of the following mechanisms does Ethernet define so that PC2 receives and processes the data? The Ethernet header lists PC2’s MAC address so that PC2 will realize that the data is meant for PC2 13. Two network pros are having a conversation about some issues in a network. They discuss some issues related to how PPP forwards data, so they happen to be discussing the data structure that includes the PPP header and trailer. Which of the following terms do they use? Packet 14. Which of the following are true facts about IP addresses? Are listed in the data-link trailer and used by routers to make a forwarding decision 15. Which of the following answers is true about Ethernet MAC addresses? All of the above. 16. Witch of the following statements is true comparing LANs and WANs? LANs generally connect devices that are nearer to each other, compared to WANs. WANs are purchased, and LANs are leased. 17. Which of the following answers list true facts about the data link layer of the TCP/IP? Two TCP/IP data-link protocols are Ethernet and PPP. Data-link protocols define addresses that identify devices connected to the underlying physical link. 18. Which of the following answers list true facts about the network layer of TCP/IP? Two TCP/IP data-link protocols are Ethernet and PPP. Data-link protocols define addresses that identify devices connected to the underlying physical link. 19. Which of the following answers lists true facts about the transport layer of ICP/IP? None of the answers are correct. 20. A PC user opens a web browser and sends a request to a web server to load a new web page. Three routers forward the data as it passes from client to server. Consider the data plus all headers and trailers that go from the web client to the web server. Which of the following headers go all the way from the web client to the web server? Network layer header, Application layer header and Data-link header. Define Key Terms TCP/IP network- It is commonly known as TCP/IP, because it’s most important protocols, the Transmission Control Protocol (TCP) and the Internet Protocol (IP), were the first networking protocols defined in this standard Networking standard- record the details of exactly what a new networking technology does, and how it does what it does. Networks do not work if the pieces do not work together, and standards help everyone agree on how something works so that it works well within the network. TCP/IP model- defines a large set of standards, which, when implemented together, create a safe and useful network. Open networking model- shares the details so that any vendor can make products using those standards. Open Systems Interconnection (OSI) model- a conceptual model that characterizes and standardizes the internal functions of a communication  system by partitioning it into abstraction layers. Encoding- Creates something like a spoken language that uses electricity Header- A place to store a message that needs to flow through the network with the user data that precedes the data. Trailer- A place to store a message that needs to flow through the network with the user data that follows the data. Leased line- the equivalent of a cable directly between tow remote sites. Internet Protocol (IP) – Lists the rules so that the network can forward data from end to end through the entire TCP/IP network. IP address- identifies a device in a TCP/IP network. IP routing- Defines exactly how routers makes their choices of how to forward data in a TCP/IP network. Frame- Refers to encapsulated data that includes the data-link header and trailer, plus everything in between. Packet- refers to what sits between the data-link hearer and trailer, but not including the data-link header and trailer.