Junos CLI Configuration Mode Top-Level Commands

JINOS primarily supports two types of command modes.

a) Operational Mode

b) Configuration Mode

a) Operational Mode: When we log in to the router and the CLI starts, we are at the top level of the CLI operational mode. In this mode, we enter the commands for

1. Controlling the CLI environment, and

2. Monitor and troubleshoot network connectivity, and

3. Initiating the Configuration Mode.

Frequently used commands in this mode include ping, show, traceroute, configure, etc.

b) Configuration Mode: We use the Configuration mode for configuring the JUNOS software by creating a hierarchy of configuration statements. We enter the configuration mode by using the command "configure" as shown below:

user@host> configure

entering configuration mode

[edit]

user@host#

In configuration mode Junos software can be configured by creating a hierarchy of configuration statements. You can do this using the CLI or by creating a text (ASCII) file that contains the statement hierarchy. (The statement hierarchy is identical in both the CLI and the text configuration file.) You can configure all properties of the JUNOS software, including interfaces, general routing information, routing protocols, and user access, as well as several system hardware properties. When you have finished entering the configuration statements, you commit them, which activates the configuration on the router.

Please check this out for CLI Configuration Mode Top-Level Commands

Also check this for CLI Operational mode Top-Level commands  and

Configuration Statement hierarchy

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Network Simulator w/ Designer for Juniper

CCNA Exam Cram : Basic Concepts Of Network Address Translation (Nat)

 NAT: A Network Address Translation (NAT) is the process of mapping an internet protocol (IP) address to another by changing the header of IP packets while in transit via a router. This helps to improve security and decrease the number of IP addresses an organization needs.

Types of NAT

There are three types of NAT; Static NAT, Dynamic NAT and PAT. These types define how inside local IP address will be mapped with inside global IP address.

Static NAT

In this type we manually map each inside local IP address with inside global IP address. Since this type uses one to one mapping we need exactly same number of IP address on both sides.

Dynamic NAT

In this type we create a pool of inside global IP addresses and let the NAT device to map inside local IP address with the available outside global IP address from the pool automatically.

PAT

In this type a single inside global IP address is mapped with multiple inside local IP addresses using the source port address. This is also known as PAT (Port Address Translation) or NAT over load.

Visit here for complete study guide for CCNA Exam 200-301

https://www.tutorialsweb.com/CertNotes/Cisco-cert/CCNA/ccna-1.htm

Juniper: Configuring IPv6 address on a interface

 IP version 6 (IPv6) is the latest version of IP. IPv6 builds upon the functionality of IPv4, providing improvements to addressing, configuration and maintenance, and security. Juniper Networks is focused on helping service provider and enterprise customers deploy IPv6 in ways that improve current networks.

IPv6 Address Format

IPv6 addresses consist of eight hexadecimal groups. Each hexadecimal group, separated by a colon (:), consists of a 16-bit hexadecimal value. The following is an example of the IPv6 format:
xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:xxxx

A group of xxxx represents the 16-bit hexadecimal value. Each individual x represents a 4-bit hexadecimal value. The following is an example of a possible IPv6 address:

4FDE:0000:0000:0002:0022:F376:FF3B:AB3F

The first sixty four bits (4FDE:0000:0000:0002) are network bits, the remaining ones are the host's interface identifier (host bits). The network portion is provided by an ISP or by the registry (ARIN or RIPE).
The length of the prefix depends on the size of your organization:

• Registries are assigned /23.
• ISPs are assigned /32.
• Sites are assigned /48.

To configure ipv6 address on an interface in juniper routers follow these instructions and commands

Note: In junos ipv6 is enabled as soon as one interface is configured for ipv6

1.Enter into configuration mode

2. Enter the [edit interfaces] mode to configure the ipv6 address of so-0/0/0 interface of Router(R1)

3. Confirm the configuration by entering the show command from configuration mode

On router (R1)

user@R1>configure
[Edit]
user@R1#edit interfaces so-0/0/0
[edit interfaces so-0/0/0]
user@R1#set unit 0 family inet6 address 2001:cb8:1::1/64
[edit interfaces so-0/0/0]
user@R1#exit
[edit]
user@R1#show

For all ipv6 and other juniper simulator labs please check this

Available practice labs for juniper 

The Cert-Ex™ Juniper Network Simulator w/designer software is a tool enables candidates to work on Juniper router and switches in a stand alone virtual lab environment. Several labs have been made available for practice in the lab manual. Both Command Line Interface (CLI) mode and Graphical User Interface (GUI) mode are available. Domains covered in the labs include 

1. Basic IP address configuration of routers and switches

2. RIP, OSPF, DHCP, NAT, Firewall configurations

3. VLAN, VTP configurations

3. STP configuration and troubleshooting