Ot
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Glossary
27
5
Click
Start Upgrading
.
Upgrading starts.
Notes
• To stop upgrading, click
Stop upgrading
.
To protect some devices, during the process of
upgrading, upgrading cannot be canceled.
• Do not turn off the power until the device restarts after
upgrading.
• While upgrading a connected camera, do not upgrade
this unit.
Glossary
Default gateway
Device that can be used to access another network.
DHCP server
Acronym for Dynamic Host Configuration Protocol
server. The IP address of a terminal without an
individual IP address can be automatically distributed by
the Dynamic Host Configuration Protocol (DHCP). The
DHCP server assigns the IP addresses to the terminals.
Digital certificate
An electronic certificate that a CA (Certificate
Authority) attests that a public key to cancel a secret
code is issued by an authentic publisher.
DNS server
Acronym for Domain Name System server. As an IP
address required for connecting to the device on an IP
network is numerical and difficult to remember, the
Domain Name System was established. A domain name
is alphabetic and is easier to remember. When a client
computer uses a domain name to connect to another
computer, it asks a DNS server to translate the name into
the corresponding IP address. The client computer can
then obtain the IP address of the computer to be
connected.
HTTP port
A port used to communicate between the web server and
the web client, such as a web browser.
IP address
Acronym for Internet Protocol Address. An individual
IP address is basically assigned to each piece of
equipment connected to the Internet.
MAC address
A network address that uniquely identifies each LAN
card.
Network address
The portion that identifies the local network (subnet) in
an IP address.
Primary DNS server
One of the DNS servers that can first reply to a request
by connected devices or other DNS servers.
