Course Summary
Red Hat is very popular in Training and certification. Red hat has many courses from the system level and network level. Recently Red Hat has updated RHEL8 version, previous it was RHEL7. Now training and certification available with Linux8 version. There are two important exam at the start level. First is RHCSA and Second is RHCE. First book code will be RH124 also called Red Hat System Administration I, this is the first level of the certification. Actually there will be two different books, first is RH124 and second is RH134. In Red Hat there will be RHCSA also called Ex200 Exam code. Means in this exam there will be two papers RH-124 and RH-134. Now red hat is providing following courses on behalf of practical and real scenario.
1. RHEL – Red Hat Enterprise Linux
2. Cloud Computing, Virtualization, and Storage
3. OpenShift
4. OpenStack
5. DevOps
6. JavaEE
7. Red Hat Fuse Decision Manager and more
8. Ansible
Above courses are very famous for the international exam, first we need to clear RHCSA and RHCE exam after RHCSA and RHCE exam can plan for the other certification exam. Now a days virtualization is very important for us. Like how to connect one computer to other computer with the help of virtual machine. In the base system can use multiple virtual computer. Virtual computer can use as a server also can use as a client. One virtual computer can interact with other virtual computer or virtual computer can interact with the physical environment. In the virtual computer also can configure as a server, can behave like DHCP Server, can behave like DNS server, Can behave like FTP Server, Can behave like Telnet server.
There are some important server which works at application layer and there are some port numbers which use by transport layer protocol. Means application layer protocols can use by transport layer protocol. DHCP has two port numbers, 67 and 68. DHCP server port number is 67 and DHCP port number is 68, FTP means file transfer protocol has two port numbers, one is 20 and other is 21, means one for the data and other for the control. Below are some famous protocol and its port number.
DNS port number 53 use by TCP and UDP
FTP port number 20 for the data and 21 for the control
Telnet port number is 23 to access one device to the other device
DHCP port number 67 and port number 68, 67 for the server and 68 for the clinet
HTTP port number is 80 other HTTPs port number is 443
POP2 port number is 109 and POP3 port number is 110
TACACS has port number 49, Terminal Access Control Access Control Services
SSH has port number 22 to access one device to other device securely
Linux has no any theory exam, all exams are based on the lab. Red Hat will provide virtual computer to the user to give the exam. In RHCSA they are providing one physical computer inside this physical computer they will give two virtual computers. We need to configure both the virtual computer, like need to configure ip address to the system, subnet mask to the system, dns ip address to the system, alternate ip address to the system. If we want to configure Teaming then need to create multiple virtual lan card first. Many virtual lan cards combined with one virtual group, can give any name to the group like TeamA or TeamB. If we want to configure redundancy or if we want to configure backup or if we want to increase the speed of lan card then NIC Teaming is the best method to communicate with each other in the network.
During the exam can not ask anything to the examiner, actually questions are available with the system and system will be locked. If system will be locked then definitely need to break the root password. Root is like super user of the network and system. Root also called administrator in terms of Microsoft. If will be able to break the password then can login to the system to see the questions, if will be not able to break the password then will be not able to see the questions.
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