Video summary

Free CCNA | Configuring Interfaces | Day 9 Lab | CCNA 200-301 Complete Course

Main summary

Key takeaways

Technology

Lab purpose (CCNA 200-301, Day 9)

Jeremy’s IT Lab presents a free CCNA 200-301 course, and this lab specifically focuses on:

  • Configuring router and switch interfaces on a single LAN
  • LAN network: 172.16.0.0/16
  • Connection to the router interface: R1 G0/0

Lab steps (six main tasks)

The lab outlines six steps:

  1. Configure hostnames
  2. Configure IP addresses
  3. Configure speed and duplex
  4. Configure interface descriptions
  5. Disable unused interfaces
  6. Save the configurations

Jeremy performs the steps device-by-device (R1 first, then SW1, then SW2), but notes the order can vary.

R1 configuration (router)

Hostname

  • Change the default router to:
    • hostname R1

Interface IP setup (G0/0)

  • Enter interface configuration mode:
    • interface g0/0
  • Verify current state:
    • show ip interface brief
  • Configure addressing:
    • IP address: 172.16.255.254
    • Prefix length: /16
      • Implied subnet mask: 255.255.0.0

Speed and duplex (manual)

  • Since the link connects to SW1, configure manually:
    • speed 1000 (1 Gbps)
    • duplex full

Interface description

  • Add a description indicating the link to SW1:
    • description … to SW1

Enable/disable logic

  • Router interfaces are shutdown by default, so:
    • Use no shutdown on G0/0
  • Re-check status with:
    • show ip interface brief
  • Note about simulator behavior:
    • Observes cases like protocol down vs expected UP/UP due to simulator mismatch.

Other router interfaces

  • Use interface range mode to mark unused ports:
    • interface range g0/1 – 2
    • Set descriptions to “not in use”

Save configuration

  • Save running config to startup config:
    • copy running-config startup-config
  • Verify:
    • show startup-config

Simulator caveat (Packet Tracer)

Packet Tracer behavior may differ from real Cisco devices (e.g., interface status/protocol state).

End hosts (PCs) addressing

Network plan

  • PCs use IPs within the 172.16.0.0/16 subnet.
  • Gateway is pre-set to R1’s address: 172.16.255.254

PC IP assignments

  • PC1: 172.16.0.1
  • PC2: 172.16.0.2
  • PC3: 172.16.0.3
  • PC4: 172.16.0.4

Subnet mask entry

  • When using TAB, the subnet mask auto-fills:
    • 255.255.0.0

SW1 configuration (switch)

Hostname

  • Set:
    • hostname SW1

Verification command (switch-specific)

  • Uses:
    • show interfaces status
  • Note: he remarks this works well on switches but not routers.

Defaults and expectations

  • Switch ports are generally not shutdown by default.
  • Speed/duplex default to auto/auto.

Active uplink to R1 (G0/1)

  • Configure:
    • speed 1000
    • duplex full
    • description … to R1

Active uplink to SW2 (G0/2)

  • Configure:
    • speed 1000
    • duplex full
    • description … to SW2

Access ports to end hosts (F0/1–2)

  • Only descriptions are configured (no speed/duplex required per lab instructions):
    • interface range f0/1 – 2
    • description … to end hosts

Shut down unused ports

  • For many unused FastEthernet ports:
    • interface range f0/3 – 24
    • set description … not in use
    • then shutdown

Simulator caveat

Packet Tracer may display settings as a-1000 / a-full (autoneg/autoconfig-like display), while a real Cisco device would typically show 1000 / full when manually configured.

Save configuration

  • Save:
    • write memory
  • Verify:
    • show startup-config

SW2 configuration (switch)

Hostname

  • Set:
    • hostname SW2

Key difference vs SW1

  • SW2 has only one active gigabit uplink:
    • G0/1 (to SW1)

G0/1 configuration

  • Configure:
    • speed 1000
    • duplex full
    • description … to SW1

Access ports to end hosts (F0/1–2)

  • Descriptions only:
    • interface range f0/1 – 2

Shutdown remaining interfaces

  • Use:
    • interface range g0/2, f0/3 – 24
  • Mark as unused and shut down:
    • description … not in use
    • shutdown

Simulator caveat (repeated)

Again observes a-1000 / a-full display differences in Packet Tracer.

Save configuration

  • Save:
    • write
  • Verify:
    • show startup-config

Main speakers / sources

  • Jeremy’s IT Lab — speaker: Jeremy (instructor conducting the lab)

Original video