Ports and Addresses

Explain how devices communicate across network media.

• The use of IP addresses is the primary means of enabling devices to locate one another and establish end-to-end communication on the internet.
• The structure of an IPv4 address is called dotted decimal notation and is represented by four decimal numbers between 0 and 255.
• An IPv4 subnet mask is a 32-bit value that differentiates the network portion of the address from the host portion. Coupled with the IPv4 address, the subnet mask determines to which subnet the device is a member.
• The default gateway address is the IP address of the router that the host will use to access remote networks, including the internet.

• IPv6 addresses are 128 bits in length and written as a string of hexadecimal values. Every four bits is represented by a single hexadecimal digit; for a total of 32 hexadecimal values. Groups of four hexadecimal digits are separated by a colon “:”.
• IPv6 addresses are not case-sensitive and can be written in either lowercase or uppercase.

Interfaces and Ports

• Network communications depend on end user device interfaces, networking device interfaces, and the cables that connect them. Types of network media include twisted-pair copper cables, fiber-optic cables, coaxial cables, or wireless.

• Different types of network media have different features and benefits. Some of the differences between various types of media include:
• • Distance the media can successfully carry a signal
  • Environment in which the media is to be installed
  • Amount of data and the speed at which it must be transmitted
  • Cost of the media and installation

Other related topics

Other useful information

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• 200-301 CCNA Exam Questions and Solutions
• 200-301 CCNA Exam Topics