1. Collision Domain
    • when data exists and can collide if going in
    • different directions
  2. MAC Address
    Physical Address of a NIC

    • 48 bits notated in hexadecimal. The first 24 characters are used to identify the
    • manufacturer. The second 24 characters are a unique identifier.
  3. ARP
    • Address Resolution Protocol, is used to
    • identify MAC Address
  4. Difference Between TCP and UDP
    • TCP
    • is a reliable three way handshake of synchronize/synchronize
    • acknowledge/acknowledge to guarantee delivery.

    • UDP
    • is unreliable, but faster
  5. 5 answers that subnetting gives you
    • Network
    • Address

    • Broadcast
    • Address

    • Subnet
    • Mast

    • Range
    • of valid IPs

    • Number
    • of hosts
  6. CIDR
    Classless Inter Domain Routing
  7. 4 steps to host to host communication.
    • 1. Check to see if the destination is on the connected network
    • 2. Select a gateway to send the packet to
    • 3. ARPs for selected gateway to get the MAC address
    • 4. Sends the packet to the resolved gateway
  8. Routing Loop
    When a data packet is continually routed through the same routers over and over. The data packets continue to be routed within the network in an endless circle.
  9. Null Routing
    A network route that goes nowhere. It is pointing an address space to an invalid destination
  10. VLAN
    Virtual LAN that exists on top of existing architecture, often with other physical hardware
  11. Trunking
    A switch port setting that does not strip the VLAN tags on outgoing packets, (Allows multiple switches to work on the same VLAN)
  12. RFC 1918
    Private IP addresses
  13. Reserved IP addresses
    • - used for loopback

    • - used for communication between hosts on a single link. Hosts obtain these
    • addresses by auto-configure, such as when a DHCP server may not be found and a
    • static IP address has not been configured. Also known as APIPA (Automatic
    • Private IP Addressing).
  14. NAT
    Network Address Translation

    A method of modifying a private IP address so that it appears as a public IP address.
  15. DHCP
    Dynamic Host Configuration Protocol.

    • Allows the automatic assignment of a dynamic IP address to a host within a defined scope of a given network.
    • (Rackspace does not deploy DHCP to any of its customers)
  16. TOE
    Transport Offload Engine

    • Allows some or all of the processing of incoming networks packets to be processed by the NIC.
    • (Rackspace's default is to turn this off)
  17. Rackspace's Networks
    Public Net: Rackspace public network that everyone can see

    Private Net: Customer specific private network

    Service Net: Rackspace service network

    DRACNET: allows DRAC access

    ExNet: Rackspace cabinet network interface
  18. 802 Standard
    Maximum of 4,096 VLANs.

    DCs are setup in zones and each zone has it's own set of VLANs.
  19. Aggregated ExNet
    the method used to bridge two or more switches in different cabinets over the same VLAN
  20. Repeater
    A device that repeats a signal to extend the 300' limit of network cable
  21. Multi-layer Switch
    A switch that functions on layer 2 & 3. It has the ability to do routing and perform on both layers.
  22. IDS
    Intrusion Detection Device

    • A device that monitors network traffic. It can
    • identify anomalous packet content or patterns of traffic that are different from normal for any particular network. Identify patterns, called signatures, of malicious content within packets coming into or leaving a network. Identify changes in the security health or "state of a server.

    IDS is managed by Alert Logic for Rackspace
  23. WAF
    Web Application Firewall

    An appliance, server plugin, or filter that applies a set of rules to an HTTP conversation
  24. DHCP Lease Period
    The time given to the dynamic IP before it expires
  25. OSI Model (Open Systems Interconnect)
    People Don't Need Those Stupid Packets Anyway

    • 7) Application Layer (IE, HTML)
    • 6) Presentation Layer (OS)
    • 5) Session Layer (HTTP, FTP), SMTP)
    • 4) Transport Layer (TCP,UDP) ICMP is a multi-layer Protocol on both layer 3 & 4
    • 3) Network Layer  (IP,addresses,routes,subnets)
    • 2) Data Link Layer (MAC Address layer-should be a unique ID found using ARP|LLC Logical Link Layer)
    • 1) Physical Layer (Cables, repeater, hub, NIC)
Card Set
Networking Basics