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A one-way function that takes a message of any length and produces a fixed-length digest. In security, a message digest is used to validate that the contents of a message have not been altered in transit. The Secure Hash Algorithm (SHA-1) and Message Digest 5 (MD5) are commonly used hashes.
A mechanism for message authentication that uses cryptographic hash functions. HMAC can be used with any iterative cryptographic hash function—for example, MD5 or SHA-1—in combination with a secret shared key. The cryptographic strength of HMAC depends on the properties of the underlying hash function.
The amount of time an OSPF router sends a hello packet to each adjacent neighbor. The JUNOS software uses a default value of 10 seconds for this timer.
Process used by an RSVP router to enhance the detection of network out- ages in an MPLS network.
An International Telecommunication Union (ITU) standard for a bit-oriented data link layer protocol on which most other bit-oriented protocols are based.
Circuit-switched wireless data transmission for mobile users, at data rates up to 38.4Kbps.
A timer used by distance-vector protocols to prevent the propagation of incorrect routing knowledge to other routers in the network.
Maximum number of seconds allowed to elapse between the time a BGP system receives successive keepalive or update messages from a peer.
Database containing information about a subscriber and the current location of a subscriber’s mobile station.
IGMP packet sent by a router to determine whether interested receivers exist on a broadcast network for multicast traffic.
IGMP packet sent by an interested receiver for a particular multicast group address. Hosts send Report messages when they first join a group or in response to a Query packet from the local router.
On an M160 router, provides routing and system management functions of the router. Consists of the Routing Engine and Miscellaneous Control Subsystem (MCS).
On a T640 routing node, provides routing and system-management functions of the router. Consists of a Routing Engine and an adjacent Control Board (CB).
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