Cisco CCNA Network Fundamentals Final Chapters

Learn how the TCP/IP protocol suite enables guaranteed delivery with a TCP three-way handshake. Compare with UDP's delivery, and see how headers and encapsulation route data between client and server.

Understand the three-way handshake that guarantees two-way communication before data transfer, with syn, syn-ack, and ack, and how layer 2/3 addressing and ports govern web traffic.

Explore how tcp and udp differ, with tcp guaranteeing delivery using sequence and acknowledgment numbers, windowing, and layered encapsulation, while udp favors speed for rapid data.

Explore how sequence and acknowledgment numbers, windowing, and multiplexing with port numbers guarantee reliable TCP/UDP delivery, while port-based access control and firewall rules manage traffic.

Learn how port numbers and well-known ports govern traffic, why devices must listen on the correct ports, and how unicast, broadcast, and multicast traffic move across layer 2–3.

Explore how unicast, broadcast, multicast, and anycast traffic work, and learn how ARP builds IP-to-MAC mappings to enable communication between devices.

Explore how ip addresses rely on mac addresses via arp, dynamic or static arp entries, and how default gateway routing shapes layer 2 and layer 3 communication.

Study basic network communication with Wireshark by tracing arp requests and replies, and understand how ip addresses are mapped to mac addresses via the arp table.

Learn how ping requests and echo replies traverse networks using ICMP, IP headers, MAC addresses, and default gateway routing, with Wireshark exposing encapsulation across layers.

Explain how traffic moves from one host to another using layer 2 and layer 3 information, including source and destination ip and mac addresses, arp lookups, and the default gateway.

Understand end-to-end communication in Cisco networks by tracking how switches and routers use layer 2 mac addresses and layer 3 ip addresses, changing macs at each hop.