Define 'computer network' using the definition in class or a better one.
What are the most common media and protocols in today's computer networks?
Who owns The Internet infrastructure aka The Internet Backbone?
Describe it. What are the most common media?
How are fiber-optic cables better than copper for short and long-line communications cables?
Explain the 4 Tier system for classifying ISPs.
What are the roles of the Ethernet Switch and IP Router in a SOHO or SMB computer network?
What protocols and addresses are used by each to carry their traffic? What OSI layers do they work on?
Name and describe each of these addresses and protocols: IP Address, MAC Address, ARP, NAT, RIP, DHCP.
On which OSI layer does each of these networking components operate? Ethernet Switch, IP Router, Cable/RF.
What is 'The Last Mile' for network or telephone connections? What services are offered over copper wire?
What services are offered over fiber optic cables?
Characterize each of these common communications services and give it's bandwidth and approximate cost:
POTS, ISDN, T-1, T-3, OC-3, OC-12, FIOS, DSL, Cable.
What's the problem with WiFi and security? What steps are needed to secure WiFi?
What's found in the system logs /var/log/secure and /var/log/messages?
In general, what does a firewall do? What features of Linux were demonstrated for firewalling a server?
What does a 'packet sniffer' do? Name a common packet sniffer.
What does a system monitor like Nagios do?
Name two softwares for monitoring or probing network security.
What are 'WiFi Analyzers' and 'WiFi Spectrum Analyzers'? What does each show?
Why is a spectrum analyzer important for a network technician's toolkit?
In the demo of setting up a LAMP stack: What does 'LAMP' stand for? What are the roles of
RackSpace and GoDaddy in the setup? What is 'reverse DNS' and why is it important? How were dig
and nslookup used to check the setup?
What does a domain registrar provide for a web server? What's the DNS manager used for?
What were the few major steps in the class demo of setting up and securing a virtual server?
Include the two that required a credit card to complete...
What it 'yum' and what does it do? What is the purpose of each component installed?
What's 'ping' used for? What does 'tracert' show?
In progress 10/26, posted 10/30 am
What functions does a 'managed switch' provide that a cheap switch doesn't.
Which of the network security tools mentioned in class did you install? What do they show?
Sketch and give a practical application for each of the network topologies sketched and discussed in class:
Serial, Bus, Star, Tree, Ring, and Mesh.
Explain these statements: An Ethernet Hub involves both Bus and Star networks.
An Ethernet Switch is inherently more secure than an Ethernet Hub.
How are these signals used? RTS, CTS, ACK, NACK.
What are handshaking and flow control in networking? What are hardware and software flow control?
Describe TCP's handshaking to establish a connection. Descibe the IP's 'sliding window' flow control.
Describe 'packetization'. What elements do ethernet frames and internet packets have in common?
What addresses are used in each. What is a CRC and how is used to help ensure error-free data transmission.
In general, what is a 'meshed network'? Name two examples of meshed networks.
What are 'fat tree' and 'spine and leaf' network architectures? Which network controllers are
important for ARM64 SoC chips to implement spine and leaf?
Discuss these methods of managing traffic on networks. In which types of networks is each
commonly used? CSMA/CD, CSMA/CA, Token Passing, Polling, IP.
What three networks are essential for Business, eBusiness, and personal computing these days?
Give a brief history of telecommunications infrastructure and regulations for telegraph, telephones,
long-line carriers, and the internet. Describe Ma Bell, Regional Bells, Verizon, and CLECs.
Include approximate years of maturity from each, and important
legislative and regulatory policies.
How are telegraph and telephone signals different? Why was telegraph important for decades after
telephone service was common?
Which companies merged to become AT&T, and when did the merge? What was the
Telecommunications Act of 1996? When was the 'Breakup of Ma Bell' and what happened in the
years following it? What is the ITU and what did it accomplish in the mid-90s?
How many bits are in IPV4 and IPV6 addresses?
How many addresses does each provide?
Characterize each/any of these protocols used for business on The Internet: TCP/IP, HTTP, CSS,
PKI/SSL/TLS, SSH, SMTP, EDI, X12, HIPA, EDIFact, ACH, VOIP, SIP, SOA/SOAP, SCADA.
What are the roles of IP Routers and Ethernet Switches in a residential, SOHO, or SMB network?
Characterize each of these common networks: PSTN, The Internet, Ethernet.
Describe the difference between packet switched and circuit switched networks. Telephone connections are circuit-swtiched --
how does that differ from packet-switched connections on the internet?
What are the OSI and TCP network models? How did they influence the adoption of Internet and Ethernet standards.
What's been the result decades later?
Name each of the organizations and say which aspect of network or internet addressing each regulates: IEEE, IANA, RIR, ICANN.
Name each of the acronyms, describe the use of each network address, and tell which organization regulates each:
AS, MAC, IP, Domain Name.
Name the two components of MAC addresses and how they're regulated.
How many bits in each of these network addresses? MAC, IPV4, IPV6
Characterize networks classified by size and name common media for each: WAN, MAN, SCADA, LAN, SAN, CAN, PAN, BAN.
Name 3 common network media for PANs? What are SCADA networks and PLCs and what media are commonly used in them?
What network media are common for LANs? What are CANs and where are they deployed?
What is 'the ground' and how is it important for copper-wired LANs? What must be avoided when networking in large
buildings or multi-building sites?
What is the 'last mile' in network connections? Name traditional digital circuits provided as last mile
connections by telephone companies. Name three services that compete with traditional digital circuits in many
Whats are LECs, ILECs, and CLECs? What legislation was important for the development of CLECs?
Describe these WAN standards: Frame Relay, MPLS, SONET.
What are T-Carrier and E-Carrier systems in the PSTN? Who uses each? Which has somewhat higher bandwidth available?
Who is the ITU and who are their members? What did they accomplish by the mid-90s?
Characterise each of these traditional telecommunications services. Give the bandwidth provided by and a reasonable
montly cost for each: ISDN BRI, ISDN PRI, T-1, T-3, OC-3, OC-12. Which are available on copper last-mile connections?
Characterise each of these telecommunications services that compete with traditional telephone company services.
State the range of bandwidth and a reasonable monthly cost for each: DSL, Cable, FTTD, WiMax, Satellite.
What are PKI, TLS, and SSL certificates? What do they do? What Internet services do they secure?
Name and describe three websites dedicated to network security.
Name two of the best-known CAs. In general, what does a more expensive SSL certificate mean?
What is the risk of using an self-issued SSL certificate, or one issued by an un-trusted CA?