# Lab 1 - VLANs

Shrimp Co. is opening their first office in Seattle, WA, and you're hired as their network administrator. The switch is racked in IDF-A and it's up to you to set up basic Layer 2 segmentation.

Tip: Individual topology files are available in the diagrams folder on my Github

# Configuration Tasks

# VLAN Configuration

Create and configure the following VLANs:

VLAN 10 - Sales Department
VLAN 20 - Engineering Department
VLAN 99 - Network Management

# Host IP Addresses & VLAN Assignment

Host	VLAN Assignment	IP Address
Bob	10 (Sales)	10.1.10.10/24
Linda	10 (Sales)	10.1.10.20/24
Alice	20 (Engineering)	10.1.20.10/24

Hosts and devices in the diagram have two IP addresses shown. 172.25.20.X is a docker management subnet that's pre-configured and allows you SSH access, while the 10.X.X.X will be configured by you in the lab.

# Success Criteria

# Primary Goals

Connectivity Test: Bob and Linda can ping each other (same VLAN)
Isolation Test: Alice cannot ping Bob or Linda (different VLANs)

# Stretch Goals

Add descriptive port descriptions to all switchports
Configure VLAN 99 SVI on the switch (interface Vlan99) with IP 10.1.99.10/24
Take a packet capture of successful pings between Bob & Lind with tcpdump interface ethernet1 filter icmp

# Verification Commands

# Show configured VLANs
show vlan [brief]

# Show interface status, duplex, speed, and more
show interfaces status

# Show MAC address forwarding table
show mac address-table

# Show configured IP interfaces
show ip interface brief

# Show configured IP information
ifconfig

# Send ICMP echo requests
ping 10.1.10.20

Confused about syntax? Hitting ? will show you all the available options for the next word in your command sequence. You can even use it after a letter to see which options start with that letter. c? will show all options starting with "c"

# Key Concepts

# Why VLANs Matter

Security: Network segmentation isolates traffic
Broadcast Control: Reduces broadcast domain size
Organization: Logical grouping of devices

# Questions to Explore

What happens when you send a broadcast in VLAN 10?
How does the switch learn where each host is located?
Why does interface VLAN 99 say down/lowerlayerdown in the output of show interfaces status?
When you took the tcpdump what parts of the output can you identify?

Linux host tips

Can't SSH to hosts? Use: docker exec -it <container-name> bash
Set static IP: sudo ip addr add 10.1.10.10/24 dev eth1

EOS 4.34.1F - Layer 2 Configuration | Virtual VLANs (VLANS)