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TMS zl Management and Configuration Guide ST.1.0.090213

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Glossary
passive mode A RIP VLAN mode in which the VLAN receives routing tables from other routers
but does not broadcast its own routing table.
passphrase A passphrase is a password that is used for authentication or encryption. A
passphrase is typically more complex than the average password.
PAT Port Address Translation. A type of destination NAT where the port is trans-
lated as well as (or instead of) the IP address.
path MTU See PMTU.
PDU Protocol Data Unit. The unit that gives the protocol control information,
either the bit (Layer 1), the frame (Layer 2), the packet (Layer 3), the segment
(Layer 4) or the data (all other layers).
peer In VPNs, the peers are the two ends of the VPN tunnel.
peer ID The identifier of the remote router in a site-to-site VPN. Generally the peer ID
is the IP address of the router on the interface through which the VPN is
established.
PEM Privacy Enhanced Mail. An IETF proposal to secure emails with public keys.
PEM depends on prior distribution of a hierarchical PKI with a single root. For
more information, see RFCs 1421–1424 at http://www.ietf.org/rfc.html.
per-hop behavior See PHB.
perfect forward
secrecy
See PFS.
persistent tunnel An IPsec SA configured as a persistent tunnel always remains open. It is
renewed even if it remains inactive longer than the tunnel lifetime.
PFS Perfect Forward Secrecy. A key-establishment protocol that is used to secure
VPN connections, wherein the key that was used to protect the transmission
of data is not used to derive any additional keys.
PHB Per-Hop Behavior. Defines how packets are queued at network nodes.
PIM-SM Protocol-Independent Multicast--Sparse Mode. A protocol used to efficiently
route traffic to multicast groups that span wide-area (WAN and inter-domain)
internets. For more information, see RFCs 2365 at www.ietf.org/rfc/
rfc2362.txt.
ping of death An attack in which the attacker sends a ping packet that is larger than 65535
bytes. Ping packets this large cause the victim device to crash, causing a DoS.