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| -rw-r--r-- | 1.0 Network Fundamentals/explor-cisco-devices-boson.md | 14 | ||||
| -rw-r--r-- | 4.0 IP Services/Network-Address-Translation.md | 2 | ||||
| -rw-r--r-- | ccna-quick-reference-notes.md | 64 | ||||
| -rw-r--r-- | subnetting-practice/2025-12-01-practice.md | 15 |
4 files changed, 95 insertions, 0 deletions
diff --git a/1.0 Network Fundamentals/explor-cisco-devices-boson.md b/1.0 Network Fundamentals/explor-cisco-devices-boson.md new file mode 100644 index 0000000..05835d0 --- /dev/null +++ b/1.0 Network Fundamentals/explor-cisco-devices-boson.md @@ -0,0 +1,14 @@ +# Explore Cisco Devices + +## Command Summary + +| Command | Description | +| configure terminal | enters global configuration mode from priviledged EXEC mode | +| enable | enters privileged EXEC mode | +| end | ends and exits configuration mode | +| exit | exits one level in the menu structure | +| interface type number | changes from global configuration mode to interface configuration mode | +| show clock | displays the system clock | +| show history | displays the session command history | +| show version | displays the system hardware version and software status | + diff --git a/4.0 IP Services/Network-Address-Translation.md b/4.0 IP Services/Network-Address-Translation.md new file mode 100644 index 0000000..097f442 --- /dev/null +++ b/4.0 IP Services/Network-Address-Translation.md @@ -0,0 +1,2 @@ +# 4.1 Configure Inside Source NAT + diff --git a/ccna-quick-reference-notes.md b/ccna-quick-reference-notes.md new file mode 100644 index 0000000..0cc055f --- /dev/null +++ b/ccna-quick-reference-notes.md @@ -0,0 +1,64 @@ +# CCNA Quick Reference Notes + +- Computer Network: Digital Telecommunications network that allows nodes to share resources +- Switches: Layer 2 devices that with many ports that connect hosts on a LAN. +- Router: Layer 3 devices that have fewer ports and connects LANs together. +- Ethernet: A collection of network protocols and standards +- Ethernet standards: IEEE 802.3 (1983) + - 10Mbps Ethernet: 802.3i 10BASE-T 100m + - 100Mbps Fast Ethernet: 802.3u 100BASE-T 100m + - 1000Mbps Gig. Ethernet: 802.3ab 1000BASE-T 100m + - 10Gbps 10 Gig. Ethernet: 802.3an 10GBASE-T 100m +- PCs - Transport (TX) data on pins one and two. +- Switches - Recieve (RX) data on pins one and two. +- PCs - RX on pins three and six. +- Switches - TX on three and six. +- Fiber Optic Connections: IEEE 802.3.ae +- Single mode: + - Narrower than multimode + - Light enters at a single angle from a laser based transmitter. + - Allows longer cables then UTP and multimode fiber. + - More expensive then multimode. +- Multimode fiber: + - Wider than single mode. + - Allows multiple light waves to enter the core. + - Allows longer cables than UTP but shorter than single mode. + - Cheaper than single mode being LED-based. +- Fiber Optic Standards: + - 1000BASE-LX 802.3Z 1Gbps multi/single 5km single + - 10GBASE-SR 802.3ae 10Gbps multi 400km + - 10GBASE-LR 802.3ae 10Gbps single 10kilo + - 10GBASE-ER 802.3ae 10Gbps single 30kilo + +## OSI Model + +Application +Presentation +Session +Transport +Network +Data Link +Physical + +MAC Address: 6 bytes (48-bits) + +## VLANs + +- A LAN is a single broadcast domain. +- A broadcast domain is a group of devices which will receieve a broadcast frame. (Destination MAC: FFFFF:FFFFF:FFFFF) +- Lots of unnecessary broadcasts traffice can reduce network performance + +### What is a VLAN? + +- Logically seperates end-hosts at Layer 2. +- Are configured on Layer 2 switches on a per-interface bases. +- Any end host connected to that interface is part of the VLAN. + +### Configuring a VLAN + +- `# sh vlan br` +- `# switchport mode access` + +An access port is a port is a port that belongs to a single VLAN, untagged port. + +Switchports that carry multiple VLANs are called trunk ports, tagged ports.
\ No newline at end of file diff --git a/subnetting-practice/2025-12-01-practice.md b/subnetting-practice/2025-12-01-practice.md new file mode 100644 index 0000000..79e6338 --- /dev/null +++ b/subnetting-practice/2025-12-01-practice.md @@ -0,0 +1,15 @@ +# Subnetting Practice for December 02, 2025 + +- /27 gives how many hosts? + - +- First host of 10.23.17.80/29 +- What's the wildcard mask for /26? + +/1 /9 /17 /25 +/2 /10 /18 /26 +/3 /11 /19 /27 +/4 /12 /20 /28 +/5 /13 /21 /29 +/6 /14 /22 /30 +/7 /15 /23 /31 +/8 /16 /24 /32
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