Course Content
Networking Today
0/7
Network Components
Network Representations and Topologies
Common Types of Networks
Internet Connections
Reliable Networks
Network Security Basic
Network Trends
Basic Switch and End Device Configuration
0/7
Cisco IOS Access
Cisco IOS Navigation
Cisco IOS Command Structure
Basic Cisco Device Configuration
Save Cisco IOS Configurations
Ports and Addresses
Configure IP Addressing
Protocols and Models
0/7
The Rules in Network Communications
Protocols
Protocol Suites
Standards Organizations
Reference Models
Data Encapsulation
Data Access
Physical Layer
0/6
Purpose of the Physical Layer
Physical Layer Characteristics
Copper Cabling
UTP Cabling
Fiber-Optic Cabling
Wireless Media
Data Link Layer
0/3
Purpose of the Data Link Layer
WAN and LAN topologies
Data Link Frame
Ethernet Switching
0/4
Ethernet Frames
Ethernet MAC Address
The MAC Address Table
Switch Speeds and Forwarding Methods
Network Layer
0/5
Network Layer Characteristics
IPv4 Packet
IPv6 Packet
How a Host Routes
Router Routing Tables
Number Systems
0/2
Binary Number System
Hexadecimal Number System
Address Resolution
Explain how ARP and ND enable communication on a network
0/3
MAC and IP
ARP
Neighbor Discovery
Basic Router Configuration
0/3
Configure Initial Router Settings
Configure Interfaces
Configure the Default Gateway
IPv4 Addressing
0/7
IPv4 Address Structure
IPv4 Unicast, Broadcast, and Multicast
Types of IPv4 Addresses
Network Segmentation
Subnet an IPv4 Network
VLSM
Structured Design
IPv6 Addressing
0/8
IPv4 Issues
IPv6 Address Representation
IPv6 Address Types
GUA and LLA Static Configuration
Dynamic Addressing for IPv6 GUAs
Dynamic Addressing for IPv6 LLAs
IPv6 Multicast Addresses
Subnet an IPv6 Network
ICMP
0/2
ICMP Messages
Ping and Traceroute Testing
Transport Layer
0/7
Transportation of Data
TCP Overview
UDP Overview
Port Numbers
TCP Communication Process
Reliability and Flow Control
UDP Communication
Application Layer
0/7
Application, Presentation, and Session
Peer-to-Peer
Web Protocols
Email Protocols
Dynamic Host Configuration Protocol (DHCP)
Domain Name Service
File Sharing Services
Network Security Fundamentals
0/4
Security Threats and Vulnerabilities
Network Attacks
Network Attack Mitigation
Device Security
Build a Small Network
0/7
Devices in a Small Network
Small Network Applications and Protocols
Scale to Larger Networks
Verify Connectivity
Host and IOS Commands
Troubleshooting Methodologies
Troubleshooting Scenarios
Basic Device Configuration
0/5
Configure a Switch with Initial Settings
Configure Switch Ports
Secure Remote Access
Basic Router Configuration
Verify Directly Connected Networks
CCNA: Switching, Routing, and Wireless Essentials
The second course in the CCNA curriculum focuses on switching technologies and router operations that support small-to-medium business networks and includes wireless local area networks (WLAN) and security concepts.
0/15
Switching Concepts
VLANs
Inter-VLAN Routing
STP
Etherchannel
DHCPv4
SLAAC and DHCPv6 Concepts
FHRP Concepts
LAN Security Concepts
Switch Security Configuration
WLAN Concepts
WLAN Configuration
Routing Concepts
IP Static Routing
Troubleshoot Static and Default Routes
CCNA: Enterprise Networking, Security, and Automation
The third CCNA course describes the architectures and considerations related to designing, securing, operating, and troubleshooting enterprise networks – including wide area network (WAN) technologies & quality of service (QoS) mechanisms for secure remote access, along with software-defined networking, virtualization, & automation concepts supporting network digitization.
0/14
Single-Area OSPFv2 Concepts
Single-Area OSPFv2 Configuration
Network Security Concepts
ACLs Concepts
ACLS for IPv4 Configuration
NAT for IPv4
WAN Concepts
VPN and IPsec Concepts
QoS Concepts
Network Management
Network Design
Network Troubleshooting
Network Virtualization
Network Automation
CCNA Course
About Lesson

Protocols

Explain why protocols are necessary in network communication.

Network Protocol Overview

Network protocols define a common set of rules that can be implemented on devices in:

  • Software
  • Hardware
  • Both

Protocols have their own:

  • Function
  • Format
  • Rules
Protocol Type Description
Network Communications Enable two or more devices to communicate over one or more networks.
Network Security Secure data to provide authentication, data integrity, and data encryption.
Routing Enable routers to exchange route information, compare path information, and select the best path.
Service Discovery Used for the automatic detection of devices or services.

Network Protocol Functions

  • Devices use agreed-upon protocols to communicate.
  • Protocols may have may have one or functions.

Protocols and Models

Function Description
Addressing Identifies sender and receiver.
Reliability Provides guaranteed delivery.
Flow Control Ensures data flows at an efficient rate.
Sequencing Uniquely labels each transmitted segment of data.
Error Detection Determines if data became corrupted during transmission.
Application Interface Process-to-process communications between network applications.

Protocol Interaction

  • Networks require the use of several protocols.
  • Each protocol has its own function and format.

Protocols and Models

Protocol Function
Hypertext Transfer Protocol (HTTP)
  • Governs the way a web server and a web client interact.
  • Defines content and format.
Transmission Control Protocol (TCP)
  • Manages the individual conversations.
  • Provides guaranteed delivery.
  • Manages flow control.
Internet Protocol (IP) Delivers messages globally from the sender to the receiver.
Ethernet Delivers messages from one NIC to another NIC on the same Ethernet Local Area Network (LAN).

Other related topics

 

Topic Title Topic Objective
The Rules in Network Communications Describe the types of rules that are necessary to successfully communicate.
Protocols Explain why protocols are necessary in network communication.
Protocol Suites Explain the purpose of adhering to a protocol suite.
Standards Organizations Explain the role of standards organizations in establishing protocols for network interoperability.
Reference Models Explain how the TCP/IP model and the OSI model are used to facilitate standardization in the communication process.
Data Encapsulation Explain how data encapsulation allows data to be transported across the network.
Data Access Explain how local hosts access local resources on a network.

 

 Other useful information

 

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