Network+

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17.    B. Passive hubs simply make physical connections, and thus are usually unpowered. All of the other types listed require power.


18.    C. A switch would increase performance by making virtual, direct connections between sender and receiver. Bridges and routers actually decrease performance because these devices introduce latency into the communication. Replacing the hub with a NIC just can’t be done.


19.    D. Because routers deal with logical network addresses, they operate at the Network layer.


20.    C. MAC addresses use a 12-digit hexadecimal number that is separated into six pairs of hex numbers. The only one that corresponds to that format is Answer C.

TCP/IP Fundamentals



THE FOLLOWING NETWORK+
EXAM OBJECTIVES ARE COVERED IN THIS CHAPTER:


2.3 Differentiate between the following network protocols in terms of routing, addressing schemes, interoperability, and naming conventions:


■    TCP/IP


■    IPX/SPX


■    NetBEUI


■    AppleTalk


^ 2.5 Define the purpose, function, and/or use of the following protocols within TCP/IP:


■    IP


■    TCP


■    UDP


■    FTP


■    TFTP


■    SMTP


■    HTTP


■    HTTPS


■    POP3/IMAP4


■    TELNET


■    ICMP


■    ARP


■    NTP


S 2.6 Define the function of TCP/UDP ports. Identify well-known ports.


S 2.7 Identify the purpose of the following network services (e.g., DHCP/bootp, DNS, NAT/ICS, WINS, and SNMP).


S 2.8 Identify IP addresses (IPv4, IPv6) and their default subnet masks.


S 2.9 Identify the purpose of subnetting and default gateways.

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