CST3607 Class Notes 2021-03-11

News & Tools


Exam #1

Access to Blackboard is required to take this exam.

  • Make sure to log into Blackboard before the day of the exam, to verify that you know your password and have access to our class section.
  • If you have difficulty logging into Blackboard, you may have to reset your password, or contact the CUNY Help Desk.

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

Chapters 1 – 5 from the CCNA Certification Study Guide, Volume 2

  • 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: Networking Fundamentals
    • Chapter 2: TCP/IP
    • Chapter 3: Easy Subnetting
    • Chapter 4: Troubleshooting IP Addressing
    • Chapter 5: IP Routing
  • 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
    • Which type of cable should be used with “like” devices?
    • Which type of cable should be used with “unlike” devices?
  • 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 numbers of all 7 layers of the OSI Reference Model
  • The layer name that devices operate 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.
  • Determine the block size / increment of each subnet, and the correct octet that increments. (The “interesting octet”)
  • 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

You should run each of the commands, and be familiar with, and understand the output/results from each.

  • 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?

Subnetting Tutorial & Reference

Lab-02 Debriefing

Troubleshooting & Verifying Networks

Document the configuration of each router in your lab

  • How to save the output from commands from a router
  • Create a new TXT file with the same filename as the simulation file you’re documenting.
    • syntax: CST3607 Lab-0# LastName, FirstName v<version #>.txt
  • At the top of the TXT file, type your CST3607 Lab-0# <YourLastName>, <YourFirstname>
  • Paste the output from all routers into the one TXT file:
    1. Make sure all routers have uniquie names: e.g. hostname 2621-A, 2621-B, etc.
    2. Close and reopen the CLI, to clear its history.
    3. enable
    4. terminal length 0
    5. show ip interface brief
    6. show ip route
    7. show ip protocol
    8. show ip ospf neighbor {If using OSPF}
    9. show controllers s0/0 or s0/1 {If the router has a DCE interface}
    10. show ip dhcp binding {If the router is acting as a DHCP server}
    11. show run {Make sure to press the space bar to complete the listing if the CLI says “More”}
    12. Select all the text in the CLI, then right-click, and choose copy. (Ctrl+a)
    13. Switch to your TXT file, and paste
    14. Save the TXT file.
    15. Repeat for each router in the lab.
  • Send the TXT file with all router configurations to me: Subject: CST3607 Lab-0# YourLastName, Firstname

Read / Watch / Do

CCNA Certification Study Guide, Volume 2

  • Read Chapter 8 ~ VLANs and Inter-VLAN Routing
  • Do the Written Labs
  • Answer the Review Questions
    • Do not submit your answers for this chapter. The answers are in the Appendix


  • Complete and submit Lab-03

Make sure to always have access to a calculator which has an Exponent function (^key) ( x) for every class.

Better Focus and Efficient Studying When Not Multitasking