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.
Answer: B. to send packets through the Internet, a company needs just one connection to an ISP. The ISP then commits to having connections to the rest of the Internet. The two companies do not need a connection to each other, or even to the same 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
Answer: B, D. A firewall normally sits inline, in the packet-forwarding path, choosing which packets to allow and disallow. An intrusion prevention system (IPS) can sit inline or outside the packet-forwarding path, reporting on complex attacks based on combinations of events. The other devices each have a different primary purpose.
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.
Answer: A, D. ISPs use the concept of a point of presence (POP) as the location where the ISP places its