Online Courses
CCNA 200-301
Online Courses
CCNA 200-301
  • Introduction
  • Interfaces And Cables
    • Ethernet
    • UTP Cables
    • Fiber Optic
    • UTP vs Fiber-Optic
    • Quiz
  • OSI Model & TCP/IP Suite
    • Networking Model
      • OSI Model
        • Application
        • Presentation
        • Session
        • Transport
        • Network
        • Data Link
        • Physical
      • PDUs
      • TCP/IP Suite
    • Quiz
  • Intro to the CLI
    • What is a CLI
      • Global Configuration Mode
      • Enable Password
    • Configuration Files
    • Canceling commands
    • Quiz
  • Ethernet LAN Switching
    • Local Area Network (LAN)
    • MAC Address
    • Ethernet Frame
    • Quiz 1
    • ARP
    • Ping
    • Quiz 2
  • IPv4 Addressing
    • Network Layer Review
    • IPv4
    • Quiz
    • Cisco CLI
    • Quiz
  • Switch Interfaces
    • CLI
    • Full/Half Duplex
    • CSMA/CD
    • Speed / Duplex Auto-Negotiation
    • Interface Errors
    • Quiz
  • IPv4 Header
    • Fields
      • Do Not Fragment
    • Quiz
  • Static Routing
    • Topology
    • CLI
    • Default Route
    • Static Route
    • Most Specific Matching Route
    • Quiz
  • Subnetting
    • Subnetting
    • Quiz
    • Variable-Length Subnet Masks
  • VLANs
    • What is a LAN ?
    • VLAN Configuration
    • Quiz 1
    • Example
    • Trunk Ports
      • Configuration
    • VLAN Ranges
    • Native VLAN
    • Router on a Stick (ROAS)
    • Quiz 2
    • Native VLAN on Router
    • Layer 3 (Multilayer) Switches
    • Quiz 3
  • DTP/VTP
    • DTP
    • VTP
    • Quiz
  • Spanning Tree Protocol
    • Network Redundancy
    • Layer 2 Loops
    • Spanning Tree Protocol
      • Exercise
    • STP Port Role Selection
      • Exercise
    • Blocking Ports
    • Quiz 1
    • States
    • Timers
    • BPDU
    • STP Toolkit
    • Configurations
    • Load-Balancing
      • Quiz
    • Quiz 2
  • Rapid Spanning Tree Protocol
    • STP Version Comparison
    • RSTP Intro
    • Quiz 1
    • BPDU
    • Link Types
    • Quiz 2
  • EtherChannel
    • Why EtherChannel is needed?
    • Load-Balancing
      • Configuration
    • PAgP, LACP, and Static
      • PAgP
      • LACP
      • Static
      • Manually Configure the Negotiation Protocol
    • EtherChannel Requirements
    • EtherChannel Verification
    • Layer 3 EtherChannel
    • Quiz
  • Dynamic Routing
    • Network Topology
    • Dynamic Routing
    • Types
      • Distance Vector Protocols
      • Link State Protocols
    • Metrics
    • Administrative Distance
      • Floating Static Routes
    • Quiz
    • RIP
      • RIPv1 & RIPv2
      • RIP Configuration
    • EIGRP
      • EGRP Configuration
    • Quiz
    • OSPF
      • Areas
      • Configuration
      • Cost
      • Neighbors
      • Loopback Interfaces
      • Network Types
      • Neighbor Requirements
      • LSA Types
    • Configuration
    • Quiz
  • First Hop Redundancy Protocols
    • Introduction
    • HSRP
    • VRRP
    • GLBP
    • Comparing FHRPs
    • Configuring HSRP
    • Quiz
  • TCP & UDP
    • Basic of Layer 4
      • Port Numbers / Session Multiplexing
    • TCP
    • UDP
    • Comparing TCP & UDP
    • Port Numbers
    • Quiz
  • IPv6
    • What about IPv5?
    • Why IPv6?
    • IPv6
    • Identifying the IPv6 Prefix
    • Configuration
    • EUI-64
      • Configuration
    • Why invert the 7th bit?
    • Global Unicast Addresses
    • Unique Local Addresses
    • Link Local Addresses
    • Multicast Addresses
    • Anycast Addresses
    • Other IPv6 Addresses
    • Representation
    • Header
    • Solicited-Node Multicast Address
    • Neighbor Discovery Protocol
      • SLAAC
      • Duplicate Address Detection (DAD)
    • IPv6 Static Routing
    • Quiz
  • Access Control Lists
    • What are ACLs?
    • How ACLs work
    • Implicit Deny
    • ACL Types
    • Standard Numbered ACLs
    • Standard Named ACLs
    • Numbered ACLs With Subcommands
    • Resequencing ACLS
    • Extended ACLs
    • Quiz
  • Layer 2 Discovery Protocols
    • Introduction
    • Cisco Discovery Protocol
    • Link Layer Discovery Protocol
    • Quiz
  • Network Time Protocol
    • The importance of time
    • Manual Time Configuration
    • Network Time Protocol
    • Reference Clocks
    • NTP Hierarchy
    • NTP Configuration
    • NTP Server mode
    • Symmetric active mode
    • NTP Authentication
    • Quiz
  • Domain Name System
    • Purpose of DNS
    • DNS Cache
    • DNS in Cisco IOS
    • Quiz
  • Dynamic Host Configuration Protocol
    • Purpose of DHCP
    • DHCP Messages
    • Relay
    • DHCP Sever configuration in IOS
    • Quiz
  • Simple Network Management Protocol
    • SNMP
    • Versions
    • Messages
    • Configuration
    • Quiz
  • Syslog
    • Syslog
    • Message Format
    • Logging Locations
    • Configuration
    • Syslog vs SNMP
    • Quiz
  • Secure Shell
    • Page
    • Console Port Security
    • L2 Switch Management IP
    • Telnet
    • SSH
    • Quiz
  • FTP & TFTP
    • FTP and TFTP
    • Trivial File Transfer Protocol
    • File Transfer Protocol
    • FTP vs TFTP
    • IOS File Systems
    • Upgrading Cisco IOS
    • Quiz
  • Network Address Translation
    • Private IPv4 Addressess
    • Network Address Translation (NAT)
    • Static NAT
    • Configuration
    • Dynamic NAT
    • Configuration
    • PAT (NAT Overload)
    • Quiz
  • Quality of Service
    • IP Phones
    • Power over Ethernet (PoE)
    • Quality of Service (QoS)
    • Queuing
    • Classification
    • IP Precedence and DSCP
    • RFC 4954
    • Trust Boundaries
    • Queuing/Congestion Management
    • Shaping and Policing
    • Classification
    • Quiz
  • Security Fundamentals
    • Why Security?
    • Concepts
    • Denial-of-service Attack
    • Spoofing Attacks
    • Reflection/Amplification Attacks
    • Man-in-the-middle Attack
    • Reconnaissance Attacks
    • Malware
    • Social Engineering Attacks
    • Password-related attacks
    • Multi-factor Authentication
    • Digital certificates
    • Controlling and Monitoring Users with AAA
    • Security Program Elements
    • Quiz
  • Port Security
    • Port Security
    • Why Port Security?
    • Enabling Port Security
    • Violation Modes
    • Secure MAC Address Aging
    • Sticky Secure MAC Addresses
    • Quiz
  • DHCP Snooping
    • DHCP Snooping
    • DHCP Starvation
    • DHCP Poisoning (Man-in-the-Middle)
    • DHCP Messages
    • DHCP Snooping Operations
    • DHCP Snooping Rate-Limiting
    • DHCP Option 82 (Information Option)
    • Quiz
  • Dynamic ARP Inspection
    • Gratuitous ARP
    • DAI
    • ARP Poisoning (Man-in-the-Middle)
    • Operations
    • Configurations
    • Optional Checks
    • ARP ACLs
    • Quiz
  • LAN Architectures
    • Common Terminologies
    • Two-Tier Campus LAN Design
    • Three-Tier Campus LAN Design
    • Spine-Leaf Architecture
    • SOHO Networks
    • Quiz
  • WAN Architectures
    • WAN
    • Leased Lines
    • MPLS
    • Internet Connections
    • Redundant Internet Connections
    • Internet VPNs
      • Site-to-Site VPNs (IPsec)
      • Remote-Access VPNs
    • Quiz
  • Virtualization & Cloud
    • Server Hardware
    • Servers before Virtualization
    • Virtualization
    • Why Virtualization
    • Connecting VMs to the Network
    • Cloud Services
    • Five Essential Characteristics of Cloud
    • Three Service Models of Cloud
    • Four Deployment Models of Cloud
    • Benefits of Cloud Computing
    • Connecting to Cloud Resources
    • Quiz
Powered by GitBook
On this page
  1. Quality of Service

IP Phones

PreviousQuizNextPower over Ethernet (PoE)

Last updated 1 year ago

Traditional phones operate over the public switched telephone network (PSTN). Sometimes this is called POTS (Plain Old Telephone Service).

IP phones use VoIP (Voice over IP) technologies to enable phone calls over an IP network, such as the Internet.

IP phones are connected to a switch just like any other end host.

IP phones have an internal 3-port switch.

  • uplink to the external switch.

  • downlink to the PC.

  • 1 port connects internally to the phone itself.

This allows the PC and the IP phone to share a single switch port. Traffic from the PC passes through the IP phone to the switch.

It is recommended to separate 'voice' traffic (from the IP phone) and 'data' traffic (from the PC) by placing them in separate VLANs.

  • This can be accomplished using a voice VLAN.

  • Traffic from the PC will be untagged, but traffic from the phone will be tagged with a VLAN ID.

Configuration

SW1(config-if)# switchport voice vlan 11

PC1 will send traffic untagged as normal. SW1 will use CDP to tell PH1 to tag PH1's traffic in VLAN 11.

SW1# show interfaces g0/0 switchport
...
Administrative Mode: static access
Operational Mode: static access
...

Although the interface send/receives traffic from two VLANs, it is not considered a trunk port. It is considered an access port.