The CCNA Cisco Certified Network Associate certification can be achieved by passing a single exam (200-301, 2020 exam objectives). The CCNA exam includes Network Fundamentals, Network Access, IP Connectivity, IP Services, Security Fundamentals, Automation, and Programmability.
The topics covered in the CCNA exam cram include the following:
I. Network Fundamentals
1. Explain role and function of network components
1.1 TCP and UDP
1.2 TCP and UDP Frames
1.3 Next-generation firewalls and IPS
1.4 Access points
1.5 Endpoints
1.6 Routers, Switches and Servers
1.7 Controllers (Cisco DNA Center and WLC)
2. Network topologies and Flow control
2.1 Different Types of N/w Topologies
2.2 Ethernet and CSMA/CD
2.3 3 tier
2.4 2 tier
2.5 Spine-leaf
2.6 Small office/home office (SOHO)
3. Compare physical interface and cabling types
3.1. Single-mode fiber, multimode fiber,copper
3.2 Connections (Ethernet shared media and point-to-point)
3.3 Concepts of POE
4. IPv4 Addressing
4.1 Subnetting (IP4)
4.2 VLSM
4.3 Examples on subnetting
5. IPv6 addressing
6. Cloud computing
7. Describe wireless principles
7.1 Nonoverlapping Wi-Fi channels
7.2 SSID
7.3 RF
7.4 Encryption
II. Cisco IOS
1. Cisco Router Architecture
1.1 Block Diagram
1.2 Architectural Components of a Router
1.3 Memory Details of a Typical Cisco Router
2. Cisco Router (25xx series) and its interfaces
2.1 Interfaces Explained
2.2 Console Port Configuration
3. Router modes of operation
4. Frequently used copy commands
5. Different types of router passwords
III. Routing Technologies
1. Routed and Routing Protocol
2. Routing protocol types
3. Static and Default route
4. Floating static route
5. Distance vector and link-state routing protocols
6. Interior and Exterior routing protocols
7. OSPFv2 for IPv4
IV. LAN Switching Technologies
1. Introduction to Cisco Switches
2. Switching methods
3. File systems available in Catalyst switches and their usage
4. Switch configuration commands
5. VLANs and VTP
6. Spanning Tree Protocol
7. CDP and LLDP
8. EtherChannel Configuration
V. WAN Technologies
1. WAN Terms
2. PPP and MLPPP
3. PPPoE
4. MPLS
5. MetroEthernet
6. DTE and DCE
7. Different cable types
8. Interface specifications
9. QoS
VI. Network Access
1. Wireless Architecture and AP modes
2. Physical infrastructure connections of WLAN components
3. Configure the components of a wireless LAN access for client connectivity using GUI
VII. IP connectivity and Services
1. DNS
2. DHCP
3. NAT
4. FHRP
5. HSRP
6. NTP
7. Capabilities and function of TFTP/FTP in the network
8. SNMPv2 and SNMPv3
9. Show commands and other related commands
VIII. Security Fundamentals
1. Security Concepts
2. Describe Security Program elements
3. Security Password policies elements
4. Layer2 security features
5. IPv4 access-list
6. IPv6 access-list
7. IP SLA
8. AAA
9. RADIUS Server
10. TACACS+ Server
11. VPN
12. Wireless Security Protocols
IX. Automation and Programmability
1. SDN
2. Capability of configuration management mechanism
3. Interpret JSON encoded data
4. Characteristics of Rest-based APIs
5. Cisco DNA center
6. Diagnostic commands
X. Appendix
1. IEEE standards
2. OSI and DoD Models
3. RIPv1 and RIPv2
4. OSPFv3 for Ipv6
5. EIGRP for IPv4
6. EIGRP for IPv6
Also check this for CCNA 200-301 Practice Exam