Wednesday, February 10, 2016

CCNAv1 Final Review (Short)

Final Review & Questions
Network Technologies:
  • Offices in multiple countries?
    • Type of network -- WAN
  • Home user high speed over phone lines?
    • DSL
  • What type of communication over the network is real-time?
    • Video Conference
    • IM (Instant Messaging)

  • “S1(config)# hostname My Switch”
    • Output:
      • “S1(config)#”
        • (You can’t have a space like that…)

  • If you want to test an internal hosts TCP/IP, what command do you use?
    • ping 127.0.0.1

  • How many addresses does a host have?
    • 2
      • IPV4
      • MAC

  • How do we reduce crosstalk in copper network cables?
    • Twisting them together

  • What is auto-MDIX?
    • Auto detecting cable types.

  • IP Addresses:
    • Class A
      • 0.0.0.0 - 127.255.255.255
    • Class B
      • 128.0.0.0 - 191.255.255.255
    • Class C
      • 192.0.0.0 - 223.255.255.255
  • Private:
    • Class A
      • 10.0.0.0 - 10.255.255.255
    • Class B
      • 172.10.0.0 - 172.31.255.255
    • Class C
      • 192.168.0.0 - 192.168.255.255
  • Nibble
    • 4 Bits
    • Subnetting IPv6 Addresses…
      • /64
      • /68
      • /72
      • /48
  • What is the purpose of “service password-encryption” and “login block-for 60 attempts 5 within 60”,
    • The first command removes passwords from plaintext and encrypts them.
    • The second command will ‘ban’ you for 5 invalid login attempts within 60 seconds.

Class
Purpose
First Octet Range
Maximum Hosts
Total Networks
Class A
Very Large Networks
1-126*
16,777,216 (2^24)
128 (2^7)
Class B
Large Enterprise
128-191
65,536 (2^16)
16,384 (2^14)
Class C
Small Business
192-223
256 (2^8)
2,097,152 (2^21)
Class D
Multicast
224-239
N/A
N/A
Class E
Experimental
240-255
N/A
N/A

0 = Class A
10 = Class B
110 = Class C
1110 - Class D
1111 - Class E

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