User’s Manual of NS3601-24P/4S Series
400
N
NAS
NAS is an acronym for Network Access Server. The NAS is meant to act as a gateway to guard access to a protected
source. A client connects to the NAS, and the NAS connects to another resource asking whether the client's supplied
credentials are valid. Based on the answer, the NAS then allows or disallows access to the protected resource. An
example of a NAS implementation is IEEE 802.1X.
NetBIOS
NetBIOS is an acronym for
Net
work
B
asic
I
nput/
O
utput
S
ystem. It is a program that allows applications on separate
computers to communicate within a Local Area Network (LAN), and it is not supported on a Wide Area Network (WAN).
The NetBIOS giving each computer in the network both a NetBIOS name and an IP address corresponding to a
different host name, provides the session and transport services described in the Open Systems Interconnection (OSI)
model.
NFS
NFS is an acronym for
N
etwork
F
ile
S
ystem. It allows hosts to mount partitions on a remote system and use them as
though they are local file systems.
NFS allows the system administrator to store resources in a central location on the network, providing authorized
users continuous access to them, which means NFS supports sharing of files, printers, and other resources as
persistent storage over a computer network.
NTP
NTP is an acronym for
N
etwork
T
ime
P
rotocol, a network protocol for synchronizing the clocks of computer systems.
NTP uses UDP (datagrams) as transport layer.
O
OAM
OAM is an acronym for
O
peration
A
dministration and
M
aintenance.
It is a protocol described in ITU-T Y.1731 used to implement carrier ethernet functionality. MEP functionality like CC
and RDI is based on this.
Optional TLVs.
A LLDP frame contains multiple TLVs
For some TLVs it is configurable if the switch shall include the TLV in the LLDP frame. These TLVs are known as
optional TLVs. If an optional TLVs is disabled the corresponding information is not included in the LLDP frame.
OUI
OUI is the organizationally unique identifier. An OUI address is a globally unique identifier assigned to a vendor by
IEEE. You can determine which vendor a device belongs to according to the OUI address which forms the first 24 bits
of a MAC address.
P
PCP
PCP is an acronym for Priority Code Point. It is a 3-bit field storing the priority level for the 802.1Q frame. It is also
known as User Priority.
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