Juniper® JNCIA Exam Cram Notes : Junos Device Portfolio

2. Junos OS Fundamentals

2.1 Junos Device portfolio

The operating system software that powers the Juniper routers is called JUNOS. The software is modular and standards based. Another important feature of JUNOS is that the software is platform independent (within Juniper hardware systems, not to be confused with other vendor hardware), thus delivering the same scalability and security across several hardware platforms.

JTAC refers to Juniper Networks Technical Assistance Center. JTAC is the recommendation body of Juniper Networks that provides suitable guidelines for Juniper devices.

Main products offered by Juniper include T-Series, M-Series, E-Series, MX-Series, J-Series routers, EX-Series Ethernet switches and SRX-Series Security products. JUNOS is the operating system that runs on most of the juniper's networking equipment.

M-Series: M7i, M10i, M40e, M120, M320

J-Series: J2320, J2350, J4350, J6350

T-Series: T320, T640, T1600, TX Matrix, TX Matrix Plus

E-Series: E120, E320, ERX310, ERX705, ERX710, ERX1410, ERX1440

MX-Series: MX80, MX240, MX480, MX960

Differences between different series of juniper routers are

1. Juniper J-Series routers are a series of enterprise routers called as modular routers for enterprises running desktops, servers, VoIP etc applications and these kind of routers are typically deployed at remote offices or branch locations.

2. Juniper M-Series routers are called Multiservice Edge routers designed for enterprise and service provider networks.

3. Juniper T-Series routers are a series of core routers designed for high-end and core networks with throughput from 320 Gbit/s to 25.6 Tbit/s with a max forwarding rate of 30.7 billion pps.

4. Juniper E-Series routers are a series of broadband services routers or edge routers which provides multiple services including broadband remote access server, broadband video services, security services, NAT etc on a single platform.

5. Juniper MX-Series routers are a family of high-performance Ethernet Services routers with powerful switching features and are designed for high-performance service providers and enterprises.

Juniper switches are available in two series

a. EX Series Ethernet Switches : Deliver high performance, carrier-class solutions built to meet the needs of today's converged branch office, campus, and data center networks.

b. QFX Series : High-performance devices deliver Juniper's unique QFabric architecture, supporting thousands of ports within a single-tier data center or cloud network with ultra-low latency, high resiliency, and the simplicity of a single switch.

Control and Forwarding plane: On juniper router, there is a separation of control and forwarding planes. Control plane is where the OS of the device resides. Control plane also maintains the routing table and the best route to reach a particular destination. Control plane then forwards the best path to the forwarding plane. Then, the forwarding plane forwards the data to the destination. Forwarding Plane enhances the performance using ASICs whereas the intelligence of the router operates in Forwarding Plane. The forwarding plane of the router is divided into multiple segments thus controlled by application specific integrated circuits (ASICs). When the interactions between these ASICs take place, the forwarding path is achieved in Juniper routers.

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