Domain 4: Review Questions Flashcards
At which layer of the OSI model does the encapsulation process begin?
A. Transport
B. Application
C. Physical
D. Session
B. The Application layer (Layer 7) is the place where the encapsulation process begins.
This layer receives the raw data from the application in use and provides services such as file transfer and message exchange to the application (and thus the user).
Which layers of the OSI model are equivalent to the Link layer of the TCP/IP model? (Choose two.)
A. Data Link
B. Physical
C. Session
D. Application
E. Presentation
A, B.
The Link layer of the TCP/IP model provides the services provided by both the Data Link and the Physical layers in the OSI model.
Which of the following represents the range of port numbers that is referred to as “well-known” port numbers?
A. 49152–65535
B. 0–1023
C. 1024–49151
D. All above 500
B. The port numbers in the range 0 to 1023 are the well-known ports, or system ports. They are assigned by the IETF for standards-track protocols, as per RFC 6335.
What is the port number for Hypertext Transfer Protocol (HTTP)?
A. 23
B. 443
C. 80
D. 110
C. 80
The listed port numbers are as follows:
23—Telnet
443—HTTPS
80—HTTP
110—POP3
What protocol in the Transmission Control Protocol/Internet Protocol (TCP/IP) suite resolves IP addresses to MAC addresses?
A. ARP
B. TCP
C. IP
D. ICMP
A. Address Resolution Protocol (ARP) resolves IP addresses to MAC addresses.
How many bits are contained in an IPv4 address?
A. 128
B. 48
C. 32
D. 64
C. IPv4 addresses are 32 bits in length and can be represented in either binary or in dotted-decimal format. IPv6 addresses are 128 bits in length and are composed of hexadecimal characters.
Which of the following is a Class C IPv4 address?
A. 172.16.5.6
B. 192.168.5.54
C. 10.6.5.8
D. 224.6.6.6
B. The IP Class C range of addresses is from 192.0.0.0 to 192.168.0.0–192.168.255.255.
Which of the following is a valid private IP address?
A. 10.2.6.6
B. 172.15.6.6
C. 191.6.6.6
D. 223.54.5.5
A. 10.2.6.6
Valid private IP address ranges are
Class A - 10.0.0.0 to 10.255.255.255
Class B - 172.16.0.0 to 172.31.255.255
Class C - 192.168.0.0 to 192.168.255.255
Which service converts private IP addresses to public IP addresses?
A. DHCP (Dynamic Host Configuration Protocol)
B. DNS (Domain Name System)
C. NAT (Network Address Translation)
D. WEP (Wired Equivalent Privacy)
C. Network Address Translation (NAT) is a service that can be supplied by a router or by a server. The device that provides the service stands between the local LAN and the Internet. When packets need to go to the Internet, the packets go through the NAT service first. The NAT service changes the private IP address to a public address that is routable on the Internet. When the response is returned from the Web, the NAT service receives it and translates the address back to the original private IP address and sends it back to the originator.
Which of the following transmission types uses stop and start bits in its communication?
A. Asynchronous
B. Unicast
C. Multicast
D. Synchronous
A. With asynchronous transmission, the systems use start and stop bits to communicate when each byte is starting and stopping. This method also uses what are called parity bits to be used for the purpose of ensuring that each byte has not changed or been corrupted en route. This introduces additional overhead to the transmission.
Which protocol encapsulates Fibre Channel frames over Ethernet networks?
A. MPLS (Multiprotocol Label Switching)
B. FCoE (Fibre Channel over Ethernet)
C. iSCSI (Internet Small Computer Systems Interface)
D. VoIP (Voice over Internet Protocol)
B. Fibre Channel over Ethernet (FCoE) encapsulates Fibre Channel frames over Ethernet networks.
Which protocol uses port number 143?
A. Remote Desktop Protocol (RDP)
B. Apple Filing Protocol (AFP)
C. Internet Message Access Protocol (IMAP)
D. Secure Shell Protocol (SSH)
C. IMAP uses port 143. RDP uses port 3389. AFP (Apple Filing Protocol) uses port 548. SSH uses port 22.
Which of the following best describes NFS?
A. An email protocol
B. A directory query protocol that is based on X.500
C. An Application layer protocol that is used to retrieve information from network devices
D. A client/server file-sharing protocol used in Unix/Linux
D. NFS is a client/server file-sharing protocol used in Unix/Linux.
Which of the following is a multilayer protocol that is used between components in process automation systems generally used in electric and water companies?
A. DNP3 (Distributed Network Protocol 3)
B. VoIP (Voice over Internet Protocol)
C. WPA (Wi-Fi Protected Access)
D. WPA2 (Wi-Fi Protected Access 2)
A. DNP3 is a multilayer protocol that is used between components in process automation systems in electric and water companies.
Which wireless communication standard includes multi-user, multiple input, multiple output (MU-MIMO)?
A. 802.11a
B. 802.11ac
C. 802.11g
D. 802.11n
B. 802.11ac includes multi-user multiple-input, multiple-output (MU MIMO).