modelling of layer 1 (physical layer) in the OSI model.
NIC
###
The ``NIC`` class is a realistic model of a Network Interface Card. The ``NIC`` acts as the interface between the
``Node`` and the ``Link``.
NICs have the following attributes:
-**ip_address:** The IPv4 address assigned to the NIC.
-**subnet_mask:** The subnet mask assigned to the NIC.
-**gateway:** The default gateway IP address for forwarding network traffic to other networks.
-**mac_address:** The MAC address of the NIC. Defaults to a randomly set MAC address.
-**speed:** The speed of the NIC in Mbps (default is 100 Mbps).
-**mtu:** The Maximum Transmission Unit (MTU) of the NIC in Bytes, representing the largest data packet size it can handle without fragmentation (default is 1500 B).
-**wake_on_lan:** Indicates if the NIC supports Wake-on-LAN functionality.
-**dns_servers:** List of IP addresses of DNS servers used for name resolution.
-**connected_link:** The link to which the NIC is connected.
-**enabled:** Indicates whether the NIC is enabled.
**Basic Example**
..code-block:: python
nic1 = NIC(
ip_address="192.168.1.100",
subnet_mask="255.255.255.0",
gateway="192.168.1.1"
)
Link
####
The ``Link`` class represents a physical link between two network endpoints.
Links have the following attributes:
-**endpoint_a:** The first NIC connected to the Link.
-**endpoint_b:** The second NIC connected to the Link.
-**bandwidth:** The bandwidth of the Link in Mbps (default is 100 Mbps).
-**current_load:** The current load on the link in Mbps.
