Secure Shell (SSH)

SSH is a protocol that aim to establish a secure #202206151232 connection between two computers. It uses the #202203221212 in order to secure the network communication between two hosts. Additionally, one could utilise the 202203221227# feature in order to Encapsulation# one Protocol (usually insecure) under SSH thus enhance the security of the protocol.

The keys are encrypted using one of the supported cryptographic algorithms such as dsa, rsa, ecdsa, ecdsa-sk, ed25519 or ed25519-sk. Such keys are usually stored in the /etc/ssh as ssh_host_rsa_key and ssh_host_dsa_key alongside with its configuration# files sshd_config and ssh_config. You can 202204272031# to other computers using the command ssh-copy-id.

Upon key changes, SSH will inform the user about that change before the user accept the key change anyway. The key change could be tampering so examine such changes with cautious.

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Well-Known Ports

#Secure Shell (SSH)
Transfers SSH Public Key

ssh-copy-id {username}@{ip-address/hostname} could be used to transfer #202205191908 public key to a remote host.
SSH Tunnelling

#Secure Shell (SSH) could be used to tunnel insecure #Transmission Control Protocol (TCP) connections such as File Transfer Protocol (FTP) or IMAP if the configuration AllowTcpForwarding is enabled. This provides a secure layer onto the TCP connection without resort to displacing such protocol within a network.
SSH Configuration

The default behaviour of #202205191908 can be changed in the file /etc/ssh/ssh_config (system-wide) or ~/.ssh/config (user specific).
Router

We could access the Router console using either console port, Telnet or Secure Shell (SSH)#, or auxiliary port (not always available). Console port is used to connect terminal or a personal computer that runs terminal emulator software.
Cisco Switch Configuration

To configure #Virtual LAN (VLAN) with Switch#, there is a need to set up an IP Address, subnet mask, and default gateway (router to direct switch management traffic for remote access such as Telnet and Secure Shell (SSH)) in a switch. The configuration could be done in IOS# with the command vlan {number} in Interface Configuration Mode follows by the IP address assigned to the VLAN. We can attach a name to a VLAN by simply running the command name {vlan-name} right after vlan {number} command in Global Configuration Mode. Define the VLAN membership mode for the assigned interface (port) as access (see Dynamic Trunking Protocol (DTP)# for other possible modes) with switchport mode {mode} and assign VLAN to it by switchport access vlan {number} in the Interface Configuration Mode.
Cisco Internetwork Operating System (IOS)

We could access an IOS device’s command line interface (CLI) using either its console (by connecting to its console port with RJ-45/mini-USB to Serial/USB rollover cable), Telnet or Secure Shell (SSH)#, or auxiliary port (uses telephone line).
Automation Controller

The basic unit for Automaton Controller is Automation Job. It consists of project (collection of 202204272036# with 202208131616# or within the Automation Controller instance), credential such as CyberArk and Vault and 202204272043# which composed of 202206151453#, username, and access method (202205251209, 202205191908, API). Automation Job could be defined in a Job Template.
Asymmetric Cryptography

Secure Shell (SSH)#
Ansible

To use Ansible, we need to install it into a node, which will become the management node or control node where we will place our configuration files or 202204272036# in here. Ansible will then run on remote hosts called managed nodes using the playbooks without actually installed into them. By default, it uses 202205191908 as the mean of communication between management node and managed nodes. We could configure it in 202204302318# to use SFTP or SCP instead. The SSH public key needs to be transferred to the managed nodes.

#cryptography #networking