Unit 3 of 3
IP Services and Connectivity
12 min
+100 points
Learning objectives
When you finish this unit, you will be able to:
- Describe the functionality of these IP Services: DHCP, DNS, NAT, SNMP, NTP.
- Recognize common protocol port values (such as, SSH, Telnet, HTTP, HTTPS, and NETCONF).
- Identify cause of application connectivity issues (NAT problem, Transport Port blocked, proxy, and VPN).
- Explain the impacts of network constraints on applications.
IP services and troubleshooting
Core IP services
- DHCP: automatic IP address assignment.
- DNS: name-to-IP resolution.
- NAT: translate private addresses to public addresses.
- SNMP: network monitoring and management.
- NTP: time synchronization across devices.
Common port values
Know ports for SSH (22), Telnet (23), HTTP (80), HTTPS (443), and NETCONF (830).
Connectivity issues
Application problems may stem from NAT misconfiguration, blocked ports, proxy settings, or VPN routing conflicts.
Network constraints
Bandwidth limits, latency, packet loss, and firewall rules all impact application performance and availability.
Exam focus: match IP services and port numbers to scenarios and diagnose connectivity problems.