Table 8-1. Network Connections (Continued)
Port Protocol Service Description MS Windows
138 TCP/UDP Netbios-dgm NetBIOS datagram
Used by Windows, as
well as UNIX services
(such as SAMBA).
Port 138 is used
primarily by the SMB
browser service that
obtains Network
Neighborhood
information.
139 TCP/UDP Netbios-ssn NetBIOS Session
Windows File and
Printer sharing.
445 TCP/UDP DNS DNS Direct Hosting
port.
In Windows 2000 and
Windows XP,
redirector and server
components now
support direct
hosting for
communicating with
other computers
running Windows
2000 or Windows XP.
Direct hosting does
not use NetBIOS for
name resolution.
DNS is used for name
resolution, and the
Microsoft networking
communication is
sent directly over
TCP without a
NetBIOS header.
Direct hosting over
TCP/IP uses TCP and
UDP port 445 instead
of the NetBIOS
session TCP port 139.
Active Directory
vSphere Basic System Administration
90 VMware, Inc.
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