JNCIP: Juniper Networks Certified Internet Professional Study Guide

A widely used hash function for use with Digital Signal Standard (DSS). SHA-1 is more secure than MD5.

A protocol that provides a secured method of logging in to a remote network system.

An IPSec term that describes an agreement between two parties about what rules to use for authentication and encryption algorithms, key exchange mechanisms, and secure communications.

A portion of the IPSec Authentication Header that communicates which security protocols, such as authentication and encryption, are used for each packet in a VPN connection.

Method used in ATM to transform IP packets into ATM cells and cells into IP packets.

Device in the mobile network that requests PDP contexts with a GGSN.

Used with multicast protocols to handle session conference announcements.

RSVP message object that is used to control the priority, preemption, affinity class, and local rerouting of the LSP.

Used with multicast protocols to handle session conference announcements.

The multicast forwarding tree established from the RP to the last hop router for a particular group address.

The name used to describe the location of the MPLS header in a data packet. The JUNOS software always places (shims) the header between the existing Layers 2 and 3 headers.

GSM service that enables short text messages to be sent to and from mobile telephones.

An algorithm used by IS-IS and OSPF to make routing decisions based on the state of network links. Also called the Dijkstra algorithm.

The multicast forwarding tree established from the first hop router to the last hop router for a particular group address.

JUNOS software command that displays the routes sent to a neighbor for a particular protocol.

JUNOS software command that displays the routes received from a neighbor for a particular protocol.

In traffic engineering, an explicit path; that is, a path determined using RSVP signaling. The ERO carried in the packets contains the explicit path information.

Protocol used in telecommunications for delivering calls and services.

Protocol governing network management and the monitoring of network devices and their functions.

An interface that assumes that packets it receives from itself are the result of a software loopback process. The interface does not consider these packets when determining whether the interface is functional.

A database structure maintained by an RSVP router to store information about a particular label-switched path.

On a M40e or M160 router as well as on a T320 or T640 routing node, the SCG provides Stratum 3 clock signal for the SONET/SDH interfaces. It also provides external clock inputs.

The multicast forwarding tree established from the source of traffic to all interested receivers for a particular group address. It is often seen in a dense-mode forwarding environment.

As part of the IGMPv3 specification, it allows an end host to request multicast traffic for a group address from a specific source of traffic.

A method of operating a multicast domain where sources of traffic and interested receivers meet at a central rendezvous point. A sparse-mode network assumes that there are very few receivers for each group address.

A method of operating a multicast domain where sources of traffic and interested receivers meet at a central rendezvous point. A sparse-mode network assumes that there are very few receivers for each group address.

Method used in distance-vector networks to avoid routing loops. Each router does not advertise routes back to the neighbor it received them from.

See static path.

In the context of traffic engineering, a static route that requires hop-by-hop manual configuration. No signaling is used to create or maintain the path. Also called a static LSP.

A configured route that includes a route and a next hop. It is always present in the routing table and doesn't react to topology changes in the network.

One of three methods of learning the rendezvous point to group address mapping in a multicast network. Each router in the domain must be configured with the required RP information.

In the context of traffic engineering, a route that must go directly to the next address in the path. (Definition from RFC 791, modified to fit LSPs.)

Routers in an MPLS named path that are required to be directly connected to the previous router in the configured path.

Dequeuing method that provides a special queue that is serviced until it is empty. The traffic sent to this queue tends to maintain a lower latency and more consistent latency numbers than traffic sent to other queues. See also Alternate Priority Queuing (APQ).

In OSPF, an area through which, or into which, AS external advertisements are not flooded.

The number of bits of the network address used for the network portion of a Class A, Class B, or Class C IP address.

OSPF link-statement advertisement flooded throughout the advertisement's associated areas by area border routers to describe the routes that they know about in other areas.

On a T320 or T640 routing node, provides the switching function to the destination Packet Forwarding Engine.

On an M40e or M160 router, a component of the Packet Forwarding Engine that provides route lookup, filtering, and switching to FPCs.

CCITT variation of SONET standard.

High-speed synchronous network specification developed by Bellcore and designed to run on optical fiber. STS-1 is the basic building block of SONET. Approved as an international standard in 1988. See also Synchronous Digital Hierarchy (SDH).

CCITT specification for SONET at 155.52Mbps.

Basic building block signal of SONET, operating at 51.84Mbps. Faster SONET rates are defined as STS-n, where n is a multiple of 51.84Mbps. See also Synchronous Optical Network (SONET).

System identifier. A portion of the ISO Network Entity Title (NET) address. The sysid can be any 6 bytes that are unique throughout a domain.

A method for storing messages to a file for troubleshooting or record-keeping purposes. It can also be used as an action within a firewall filter to store information to the messages file.

On an M40 router, the part of the Packet Forwarding Engine that performs route lookups, monitors system components, and controls FPC resets.

On an M20 router, Packet Forwarding Engine component that performs route lookups and component monitoring and monitors FPC operation.