• CCNA Vol 1
    • Vol 1 Part 1: Intro
      • All Content Part 1
      • Ch01: Intro to TCP/IP
      • Ch02: Intro to Ethernet
      • Ch03: Intro Routing, WAN
    • Vol 1 Part 2: Ethernet
      • All Content Part 2
      • Ch04: Command Line
      • Ch05: Ethernet Switching
      • Ch06: Switch Management
      • Ch07: Switch Interfaces
    • Vol 1 Part 3: VLANs, STP
      • All Content Part 3
      • Ch08: Virtual LANs
      • Ch09: Spanning Tree
      • Ch10: RSTP and EtherChannel
    • Vol 1 Pt 4: IP Addresses
      • All Content Part 4
      • Ch11: IPv4 Subnetting
      • Ch12: Classful IPv4 Networks
      • Ch13: IPv4 Subnet Masks
      • Ch14: Analyzing IPv4 Subnets
      • Ch15: Subnet Design
    • Vol 1 Part 5: IP Routing
      • All Content Part 5
      • Ch16: Operating Routers
      • Ch17: Router Addresses and Routes
      • Ch18: Routing in LANs
      • Ch19: DHCP
      • Ch20: Troubleshooting Routing
    • Vol 1 Part 6: OSPF
      • All Content Part 6
      • Ch21: OSPF Concepts
      • Ch22: OSPF – Basic Features
      • Ch23: OSPF – Optional Features
      • 200-301 V1 Ch24: OSPF Neighbors
    • Vol 1 Part 7: IPv6
      • All Content Part 7
      • Ch25: IPv6 Fundamentals
      • Ch26: IPv6 Addressing
      • Ch27: Configure IPv6 Addressing
      • Ch28: IPv6 Addressing on Hosts
      • Ch29: Configure IPv6 Routing
  • CCNA Vol 2
    • Vol 2 Part 1: Wireless
      • All Content Part 1
      • Ch01: WLAN Fundamentals
      • Ch02: WLAN Architectures
      • Ch03: Securing WLANs
      • Ch04: Building WLANs
    • Vol 2 Part 2: IP ACLs
      • All Content Pt. 2
      • Ch05: TCP/IP Transport
      • Ch06: Standard ACLs
      • Ch07: Extended ACLs
      • Ch08: Applied ACLs
    • Vol 2 Part 3: Security Services
      • All Content Pt. 3
      • Ch09: Security Arch.
      • Ch10: Securing Devices
      • Ch11: Port Security
      • Ch12: DHCP Snooping & DAI
    • Vol 2, Part 4: IP Services
      • All Content Pt. 4
      • Ch13: Device Management Protocols
      • Ch14: NAT
      • Ch15: QoS
      • Ch16: FHRPs
      • Ch17: SNMP, FTP, TFTP
    • Vol 2 Part 5: Architectures
      • All Content Pt. 5
      • Ch18: LAN Architecture
      • Ch19: WAN Architecture
      • Ch20: Cloud Architecture
    • Vol 2 Part 6: Automation
      • All Content Pt. 6
      • Ch21: Controller-Based Networks
      • Ch22: Cisco SDA
      • Ch23: REST and JSON
      • Ch24: Ansible and Terraform
  • Labs
    • Config Labs, Volume 1
      • All Labs, Volume 1
      • Part 2 – Ethernet
      • Part 3 – VLAN, STP
      • Part 5 – IP Routing
      • Part 6 – OSPF
      • Part 7 – IPv6
    • Config Labs, Volume 2
      • All Labs, Volume 2
      • Part 2 – IP ACLs
      • Part 3 – Security
      • Part 4 – IP Services
      • CML-Free-Labs
  • Q&A
    • Q&A Set #1
    • IPv4 Ch. 11 Addressing Basics
    • IPv4 Ch. 12 Network Analysis
    • IPv4 Ch. 13 Mask Drills
    • IPv4 Ch. 14 Address Drills
    • IPv4 Ch. 15 Design Drills
    • IPv4 VLSM
    • IPv4-Adv Summary Routes
    • IPv6 Address Drills
    • OSPF Enabler
    • STP vs RSTP
    • STP Puzzle
  • General
    • Career
    • News
    • Study Tips
  • Reference
    • Product Links
    • Config Labs
    • Final Review
    • Comparing Book Editions
    Discussions to build real CCNA skills
    • CCNA Vol 1
      • Vol 1 Part 1: Intro
        • All Content Part 1
        • Ch01: Intro to TCP/IP
        • Ch02: Intro to Ethernet
        • Ch03: Intro Routing, WAN
      • Vol 1 Part 2: Ethernet
        • All Content Part 2
        • Ch04: Command Line
        • Ch05: Ethernet Switching
        • Ch06: Switch Management
        • Ch07: Switch Interfaces
      • Vol 1 Part 3: VLANs, STP
        • All Content Part 3
        • Ch08: Virtual LANs
        • Ch09: Spanning Tree
        • Ch10: RSTP and EtherChannel
      • Vol 1 Pt 4: IP Addresses
        • All Content Part 4
        • Ch11: IPv4 Subnetting
        • Ch12: Classful IPv4 Networks
        • Ch13: IPv4 Subnet Masks
        • Ch14: Analyzing IPv4 Subnets
        • Ch15: Subnet Design
      • Vol 1 Part 5: IP Routing
        • All Content Part 5
        • Ch16: Operating Routers
        • Ch17: Router Addresses and Routes
        • Ch18: Routing in LANs
        • Ch19: DHCP
        • Ch20: Troubleshooting Routing
      • Vol 1 Part 6: OSPF
        • All Content Part 6
        • Ch21: OSPF Concepts
        • Ch22: OSPF – Basic Features
        • Ch23: OSPF – Optional Features
        • 200-301 V1 Ch24: OSPF Neighbors
      • Vol 1 Part 7: IPv6
        • All Content Part 7
        • Ch25: IPv6 Fundamentals
        • Ch26: IPv6 Addressing
        • Ch27: Configure IPv6 Addressing
        • Ch28: IPv6 Addressing on Hosts
        • Ch29: Configure IPv6 Routing
    • CCNA Vol 2
      • Vol 2 Part 1: Wireless
        • All Content Part 1
        • Ch01: WLAN Fundamentals
        • Ch02: WLAN Architectures
        • Ch03: Securing WLANs
        • Ch04: Building WLANs
      • Vol 2 Part 2: IP ACLs
        • All Content Pt. 2
        • Ch05: TCP/IP Transport
        • Ch06: Standard ACLs
        • Ch07: Extended ACLs
        • Ch08: Applied ACLs
      • Vol 2 Part 3: Security Services
        • All Content Pt. 3
        • Ch09: Security Arch.
        • Ch10: Securing Devices
        • Ch11: Port Security
        • Ch12: DHCP Snooping & DAI
      • Vol 2, Part 4: IP Services
        • All Content Pt. 4
        • Ch13: Device Management Protocols
        • Ch14: NAT
        • Ch15: QoS
        • Ch16: FHRPs
        • Ch17: SNMP, FTP, TFTP
      • Vol 2 Part 5: Architectures
        • All Content Pt. 5
        • Ch18: LAN Architecture
        • Ch19: WAN Architecture
        • Ch20: Cloud Architecture
      • Vol 2 Part 6: Automation
        • All Content Pt. 6
        • Ch21: Controller-Based Networks
        • Ch22: Cisco SDA
        • Ch23: REST and JSON
        • Ch24: Ansible and Terraform
    • Labs
      • Mega Widget 4
      • Config Labs, Volume 1
        • All Labs, Volume 1
        • Part 2 – Ethernet
        • Part 3 – VLAN, STP
        • Part 5 – IP Routing
        • Part 6 – OSPF
        • Part 7 – IPv6
      • Config Labs, Volume 2
        • All Labs, Volume 2
        • Part 2 – IP ACLs
        • Part 3 – Security
        • Part 4 – IP Services
        • CML-Free-Labs
    • Q&A
      • Q&A Set #1
      • IPv4 Ch. 11 Addressing Basics
      • IPv4 Ch. 12 Network Analysis
      • IPv4 Ch. 13 Mask Drills
      • IPv4 Ch. 14 Address Drills
      • IPv4 Ch. 15 Design Drills
      • IPv4 VLSM
      • IPv4-Adv Summary Routes
      • IPv6 Address Drills
      • OSPF Enabler
      • STP vs RSTP
      • STP Puzzle
    • General
      • Career
      • News
      • Study Tips
    • Reference
      • Product Links
      • Config Labs
      • Final Review
      • Comparing Book Editions
    A: A Port Security Question
    By certskills
    In 200-301 V2 Ch11: Port Security, 200-301 V2 Part 3: Security Services, CCENT-OLD, Q&A
    Posted September 7, 2015

    A: A Port Security Question

    You know the drill. Check this earlier port security question, and then come back here to check your answer and logic. The answer is below the fold. Enjoy!

    READ MORE
    Housekeeping Notice: No Config Labs for this Book Part
    By certskills
    In Config Lab CCNA Vol 1 Part 1, Config Lab CCNA Vol 1 Part 8, Config Lab CCNA Vol 2 Part 4, Config Lab CCNA Vol 2 Part 5
    Posted September 6, 2015

    Housekeeping Notice: No Config Labs for this Book Part

    In this blog, some menu categories do not happen to have any posts associated with them. That’s just coincidence regarding what topics I’ve happened to choose over the many years of [...]

    READ MORE
    Q: A Port Security Question
    By certskills
    In 200-301 V2 Ch11: Port Security, 200-301 V2 Part 3: Security Services, CCENT-OLD, Q&A
    Posted September 3, 2015

    Q: A Port Security Question

    The  lobby has a live Ethernet port: it’s time to lock that port down with port security. As usual, this post poses the question, and the next post (which will be linked at the bottom of [...]

    READ MORE
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