CST3607 Class Notes 2019-03-07

Exam #1

Access to Blackboard is required to take this exam.

  • Make sure you’re able to log into Blackboard before the day of the exam, to make sure that you have sufficient time to resolve any issues.
  • If you have difficulty logging into Blackboard, depending on what the issue is, you may have to reset your password, or contact the CUNY Help Desk.

The exam includes, but is not limited, to the following:

Chapters 1 – 5 from the CCNA Routing and Switching Study Guide 2nd Edition

  • You must be able to correctly answer all of the review questions at the end of each chapter.
  • Know the Exam Essentials & terminology from each chapter.
    • Chapter 1: Internetworking Basics & Models, OSI Reference Model
    • Chapter 2: Ethernet Networking and Data Encapsulation
    • Chapter 3: Introduction to TCP/IP
    • Chapter 4: Subnetting
    • Chapter 5: VLSM, Route Summarization
  • Collision Domains vs Broadcast Domains
    • Which device is used to separate broadcast domains?
    • How many collision domains does a switch have?
    • How many collision domains does a hub have?
    • How do VLANs change the topology of the LAN and the Broadcast Domain created by the router?
  • Unicast vs Broadcast vs Multicast
  • Ethernet cables: Straight-through vs Cross-over vs console
  • What is CSMA/CD? How does CSMA/CD work?
  • The number of bits and number of bytes in different types of addresses: IPv4, IPv6, MAC

OSI Reference Model:

  • The names and layer numbers of all 7 layers
  • The layer name that devices operatate on: e.g. Hub, Switch, Router, NIC
  • The type of addressing used on Layer 2, and Layer 3
  • The layer name that certain protocols operate on: e.g. ARP, IP, TCP, Telnet, FTP
  • Which layer of the OSI model is responsible for creating packets?
  • Which layer of the OSI model is responsible for creating frames?
  • Segmentation and reassembly of data from the upper-layer applications occurs at what layer?

Classfull vs Classless (CIDR) IP addressing

  • Define the “default mask”


  • Determine the # of bits for: Network, Host, Bits Borrowed.
  • Determine the Number of: Subnets, addresses per subnet, Wildcard mask.
  • Determine the dotted-decimal mask from the number of host bits or the prefix.
  • Count the borrowed bits on your fingers to determine the mask.
    • 1281922242402482522542551 bit2 bits3 bits4 bits5 bits6 bits7 bits8 bits
  • Determine the block size / increment of each subnet, and the correct octet that increments.
  • When subnetting, are we increasing or decreasing the number of 1’s for the network portion of the IP address?
  • When supernetting, are we increasing or decreasing the number of 1’s for the network portion of the IP address?

Converting a decimal number to its Base-256 dotted-decimal form.

Know the powers of 2 up to 8192.

VLSM / Classless Subnetting

Route Summarization / Route Aggregation / Network Address Aggregation


  • Roles/function, and full name.
  • IPv4, DHCP, DNS, ARP, TCP, UDP, ICMP, etc.

Troubleshooting Commands

  • ping <Target IP Address>
  • tracert <Target IP Address>
  • ipconfig /all
  • arp -a
  • netstat


  • All four phases of the DHCP handshake, in the correct order, and mode of transmission (unicast, broadcast) for each phase.
  • What is the purpose of the DHCP Scope on the DHCP Server?

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