CompTIA Network+ Objective 1.1 Practice Questions
What is a packet?
A portion of a message broken down into bytes.
What is a service?
A service is a program that runs in the background, independent of a logon, that performs one or more system functions.
Which protocol is HTTP directly encapsulated in? A: TCP B: UDP C: ICMP D: IP
A: TCP
What is Apache?
Apache is a Web server (HTTP).
Which protocol is DHCP directly encapsulated in? A: TCP B: UDP C: ICMP D: IP
B: UDP
Which protocol is used for information and error reporting? A: TCP B: UDP C: ICMP D: IP
C: ICMP
What does DNS stand for?
Domain Name System/Server
What does DHCP stand for?
Dynamic Host Configuration Protocol
What does FTP stand for?
File Transfer Protocol
What does HTTP stand for?
Hypertext Transfer Protocol
What is Internet Control Message Protocol (ICMP) used for?
ICMP is used by utilities like ping and tracert/traceroute to provide control information to IP.
What does ICMP provide?
ICMP provides informational and error reporting to devices.
What are IP addresses?
IP addresses are assigned manually (static) or automatically (dynamic) to devices when sending data over a TCP/IP network. They are found in packets at OSI Layer 3.
What are the two types of ICMP messages?
Informational messages and error messages.
What does ICMP stand for?
Internet Control Message Protocol
What does IMAP stand for?
Internet Message Access Protocol
What are MAC addresses?
MAC addresses, or Media Access Control, are found in frames at OSI Layer 2. They uniquely identify a device on the network. It is also known as a physical address or Ethernet address. A MAC address is made up of 6-byte parts.
What does NIC stand for?
Network Interface Card
Internet Protocol (IP) encapsulates all messages at what OSI layer?
OSI Layer 3
What OSI layer are TCP and UDP segments encapsulated in IP packets?
OSI Layer 3
What OSI layer do TCP and UDP headers use to correspond with a program or service on a machine?
OSI Layer 4
What OSI layers do TCP and UDP segments send data from?
OSI Layer 5, 6, & 7
What port do FTP servers listen for incoming traffic and send their own traffic?
Port 21
What port do Web servers listen for incoming traffic and send their own traffic?
Port 80
What are protocols?
Protocols are rules for communication that must be followed and the software must be written to follow those rules. Protocols are used by devices to send and receive different types of communication.
What does RTSP stand for?
Real Time Streaming Protocol
What does SSL stand for?
Secure Sockets Layer
What does SMTP stand for?
Simple Mail Transfer Protocol
What four simple fields do UDP headers contain?
Source port, Destination port, Length, and Checksum (for error checking)
How does the TCP three way handshake work?
Step 1: The source or client sends a synchronization (SYN) flag to the server by placing a 1 in that bit position, and generates a pseudo-random sequence number that it places in the Sequence Number field. The source places the TCP header in the IP packet, places the packer in a frame, and, assuming a remote connection, sends the frame to the default gateway. Step 2: When the TCP segment arrives at the destination and the server acknowledges it, it sends its own TCP header. The destination turns on the Acknowledgement (ACK) flag and increments the sequence number that the source sent, by one, in the Acknowledgement Number field. In the same TCP header, the destination also raises an SYN flag and comes up with its own pseudo-randomly generated sequence number. Step 3: The source responds to this by sending another TCP segment with the ACK flag on, incrementing the sequence number sent by the destination by one in the Acknowledgement Number field. At this point, the two systems are connected. Note: The TCP segments in the three steps didn't have any data. It was just control messages in the TCP header. Now if any information is shared it's encapsulated by the TCP headers.
Explain the difference between TCP and UDP.
TCP (Transmission Control Protocol): -Accurate -Connection-oriented -Can't lose packets -Logical UDP (User Datagram Protocol): -Efficient -Connectionless -Can lose packets -Quick performance
What is the purpose of a common TCP/IP protocol suite?
The purpose of a common TCP/IP protocol suite is to allow any device to talk to any other device.
What is the purpose of ports?
The purpose of ports is to represent a logical way for traffic to move into and out of a program or service on a machine.
What does TCP stand for?
Transmission Control Protocol
What does TLS stand for?
Transport Layer Security
What three fields do ICMP headers always use?
Type, Code, and Checksum
What does UDP stand for?
User Datagram Protocol
