Chapter 4 of 6 · Cisco CCNA 200-301
IP Services
NAT, NTP, DHCP, DNS, SNMP, syslog, QoS, SSH and file transfer, and how the topics fit together.
- 9topics
- 40 minfast track
- 3diagrams and exhibits
- 10%of the exam
Topics in this chapter
Take them in order, or jump to the one you need.
- 1Inside Source NAT: Static and PoolsLearn how inside source NAT works on a Cisco router, with static and pool translations, the four NAT address terms, and the…Diagram6 min
- 2NTP in Client and Server ModeSee how NTP keeps device clocks in sync, what stratum means, and how to set up an NTP server and client on a Cisco router and…4 min
- 3The Role of DHCP and DNSUnderstand what DHCP and DNS each do on a network, how a host gets an address through DORA, how names resolve, and where the two…5 min
- 4The Function of SNMPLearn what SNMP does in network operations, how managers and agents exchange data, the differences between v1, v2c and v3, and…4 min
- 5Syslog Facilities and Severity LevelsLearn how syslog messages are built, what the eight severity levels mean, what a facility is, and how a Cisco device sends logs…4 min
- 6DHCP Client and Relay ConfigurationConfigure a Cisco interface as a DHCP client and set up a DHCP relay with ip helper-address, so hosts can get addresses from a…Diagram5 min
- 7QoS Per-Hop BehaviorUnderstand how QoS treats traffic hop by hop, including classification, marking, queuing, congestion avoidance, policing and…4 min
- 8Remote Access with SSHConfigure a Cisco device for secure remote access with SSH, including the hostname, domain name, RSA keys, local users and vty…4 min
- 9TFTP and FTP in the NetworkCompare TFTP and FTP, what each is used for in a network, the ports and security differences, and how to copy configs and images…4 min
About this chapter
What this chapter covers
IP Services are the supporting functions that make a network usable and manageable.
Some help hosts get online, such as DHCP and DNS. Some save public addresses, such as NAT. Others help you run the network: keeping clocks in sync, collecting logs, monitoring devices, reaching them securely, moving files and protecting important traffic.
The chapter follows domain 4.0 of the Cisco CCNA 200-301 version 1.1 exam topics, which is called IP Services. It has nine published objectives, and each gets its own page.
Weight in the exam
Domain 4.0 carries about 10 percent of the published exam objectives.
It is one of the smaller domains, but its topics are specific and fact-heavy. The objectives mix explaining what each service does with configuring a few of them, such as NAT, NTP and SSH.
How the topics fit together
The services are separate, but they depend on each other in practice.
On the management side, the services work as a team:
- NTP keeps clocks aligned, so syslog timestamps line up across devices.
- SNMP lets a monitoring system poll devices and receive alerts.
- SSH replaces Telnet for the command line.
- TFTP and FTP move backups and software images.
- QoS decides which traffic wins when links are busy, so voice and video are protected.
How to use these pages
Each topic page has the same shape, so you can skim for what you need.
- What it is: the idea in plain words.
- How it works: the mechanism, with diagrams and example commands.
- What to remember for the exam: the facts to memorise.
- Common mistakes: the classic traps.
- Check yourself: three prompts to test your understanding.
Treat commands as examples of the pattern, and practise them in a lab or simulator.
Ready for more practice?
The full Cisco CCNA 200-301 question bank has 1,206 questions, with timed practice exams and an explanation for every answer.
This study guide is independent and is not affiliated with, endorsed by, or sponsored by Cisco. Vendor names, certification names and exam codes are trademarks of their respective owners and are used for identification only.