Network+ Chapter 2 Review Questions

IP addresses reside at which layer of the OSI reference model? a. Network layer b. Session layer c. Data link layer d. Transport layer

a. An IP address is typical ingredient at the network layer (Layer 3) of the OSI model. Routers use these addresses to route traffic through an internetwork.

Identify three e-mail protocols. (Choose three.) a. SNMP b. SMTP c. POP3 d. IMAP4

b, c, d. SMTP, POP3, and IMAP4 are all examples of email protocols. Note that it is very easy to confuse SMTP with SNMP. Simple Network Management Protocol aids in the robust management of network devices.

Which approach to bandwidth usage consumes all the available frequencies on a medium to transmit data? a. Broadband b. Baseband c. Time-division multiplexing d. Simplex

b. Baseband technology uses the entire medium to transmit. You should contrast this to broadband technology, which can divide the medium up into different channels. A great example of the broadband is the use of the coaxial cable you might have in your home, which carries cable television signaling as well as high-speed Internet.

Which protocol supports a secure connection to a remote host via terminal emulation software? a. Telnet b. SSH c. FTP d. SFTP

b. Secure Shell (SSH) provides a secure alternative to Telnet when it comes to remotely accessing a network device for management of that device.

Which layer of the OSI reference model contains the MAC and LLC sublayers? a. Network layer b. Transport layer c. Physical layer d. Data link layer

d. The data link layer of the OSI model is the only layer of the famous model that we typically divide into sublayers (the MAC and LLC sublayers).

Identify the four layers of the TCP/IP stack. (Choose four.) a. Session layer b. Transport layer c. Internet layer d. Data link layer e. Network layer f. Application layer g. Network interface layer

b, c, f, g. The DoD TCP/IP model features just four layers. From the bottom up they are network interface, Internet, transport, and application.

What is the range of well-known TCP and UDP ports? a. Below 2048 b. Below 1024 c. 16,384 - 32,768 d. Above 8192

b. The well-known port numbers are all below 1024. An example would be HTTP (WWW) at port 80.

Identify the well-known UDP port number for NTP. a. 53 b. 69 c. 123 d. 143

c. The Network Time Protocol (NTP) relies on port 123.

Windowing is provided at what layer of the OSI reference model? a. Data link layer b. Network layer c. Transport layer d. Physical layer

c. The transport layer offers TCP and UPD. With TCP, a connection-oriented protocol, windowing can be used to dictate how much data is sent at one time.

Which of the following is a connectionless transport layer protocol? a. IP b. TCP c. UDP d. H.323

c. User Datagram Protocol (UDP) sacrifices reliability for speed and efficiency in the transport of data.