What is the general strategy for solving problems on network technologies from Cisco?

Question

Computer networks

Good afternoon, dear magicians of telecom
, tell me, please, is there a general approach to solving problems from the CCNA course? now I am studying in courses, we were given a very general theory and a task that is not clear how it is connected with a deeply abstruse theory. Where to start - it is completely unknown
whether there are books where examples of solving tsisko tasks are described? What is the entry point to solving problems of this kind?
the task itself is devoted to the topic of NAT and DHCP

Answer 1

From bottom to top according to the OSI model:
L1 connect devices
L2 configure VLANs,
L3 IP addresses, static routes; configure NAT

Answer 2

The general strategy is to make everything work. Tool - truncated packet tracert

Answer 3

It is very strange that at CCNA you are given only a very general theory. At the official courses of the cisco network academy, a lot of attention is paid to practice - in fact, there is practice with examples for everything. In connection with the above, I recommend the official training material from cisco.
For example https://learningnetwork.cisco.com/welcome - you need to register to gain access, registration is free.
A very good presentation of the material in the series of articles "Networks for the smallest" linkmeup.ru/blog/11.html , don't be confused by the name, starting from part 6, serious and adult things begin there, all with examples with author's pictures and a detailed explanation.
As for the tasks, they can be conditionally divided into two types: configuration and troubleshooting in the existing network (troubleshooting).
When setting up, you should move from the bottom to the top of the OSI model.
That is, first the physical layer - the selection and connection of wires, setting up synchronization on synchronous interfaces, etc.
Then channel - assignment to VLAN ports, trunk configuration, link aggregation, etc.
Next, network - defining and configuring addressing, configuring routing, NAT / PAT, etc.
Transport - configuring sockets, ACLs, firewalls, etc.
And so on up until the goal is reached.
When troubleshooting, there are several options:
1. From the bottom up in OSI - just like when setting up, we first check the physics, then L2, and so on up to the applied one.
2. From top to bottom in OSI - on the contrary, first we check the application and then down.
3. We start from the middle - usually from the network, if everything works fine, then we go up, if there are problems already there, we go down.
4. Pointwise, based on experience - for example, if, after switching to another channel, problems with IP telephony began to climb out, we immediately look at jitter and QoS.
Regarding the picture - the task shown on it is clearly not from the official cisco training course, so I would recommend that if you have such questions, contact your instructor / teacher / whoever teaches the "CCNA" course with them.