vault backup: 2025-01-08 10:48:09

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diff --git a/.trash/3 resources/linux/networking/dhcp.md b/.trash/3 resources/linux/networking/dhcp.md
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+Dynamic Host Configuration Protocol
+Allows hosts dynamically receive an IP address.
+
+[[TODO]] learn exactly how it works
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diff --git a/.trash/3 resources/linux/networking/ip-masquerade-nat.md b/.trash/3 resources/linux/networking/ip-masquerade-nat.md
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+A function in the kernel that allows guests with internal/private IPs to access the internet by using the hosts' public IP similar to 1 to many NAT.
+
+Differences with Proxy, IP Masq, NAT:
+
+**Proxy**
+Requires special configuration on internal client side. Can be used for caching.
+
+**IP Masq**
+A form of NAT used primarily in Linux devices. Translates IP address and uses the connection tracking table and ports to map responses back to the internal connection.
+
+**NAT**
+Has different types with different use-cases.
+Static NAT: 1-1 mapping of pub/private IP. Dynamic NAT: pool of pub ips to dynamically map private IPs to based on availability. 
+PAT (Port): similar to IP Masq; 1-many using ports.
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diff --git a/.trash/3 resources/linux/networking/nbp.md b/.trash/3 resources/linux/networking/nbp.md
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+Network Bootstrap Program
+
+Is a bootloader that is obtained via the network typically via [[TFTP]]. It handles setting up an environment in which an OS can run or install. For example, it displays a boot menu and downloads the kernel images. It sets up hardware, for example the [[NIC]]s.
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diff --git a/.trash/3 resources/linux/networking/pxe-boot.md b/.trash/3 resources/linux/networking/pxe-boot.md
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+PXE = Preboot Execution  Environment. 
+
+PXE boot process:
+1. Modified [[DHCP]] request: request to include boot information (PXE boot request).
+2. Process DHCP response which includes an IP address of [[TFTP]] server and filename of [[NBP]].
+3. Download NBP over TFTP.
+4. NBP executes
+	1. Loads additional stuff over network, like kernel images.
+	2. Handles the boot menu
+5. Kernel takes over boot process and potentially downloads additional files required to complete booting.
+
+Popular NBP's:
+- PXELINUX
+- iPXE
+- GRUB2
diff --git a/.trash/3 resources/linux/networking/udp.md b/.trash/3 resources/linux/networking/udp.md
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