Chapter 8 Flashcards
(36 cards)
Define subnetting.
Taking a larger network and breaking it into smaller networks. p. 235
name the three steps for creating a subnet.
1) Determine the number of reequired network IDs
2) Determine the number of required host IDs per subnet
3) Based on the previous requirements, create
a) subnet mask for entire network
b) a unique subnet ID for each segment
c) a ranch of host IDs for each subnet p. 235
Define subnet mask.
a 32 vit value that allows the recipients of IP pachets to distinguishy the network ID portion of the IP address from the host ID protion of the IP address. p.236
What is the default subnet mask for a Class A network?
255.0.0.0 p.237
What is the default subnet mask for a Class B network?
255.255.0.0 p.237
What is the default subnet mask for a Class C network?
255.255.255.0 p.237
Define Classless Inter-Domain Routing.
The method that internet service providers use to allocate a number of addresses to a company or home connection. p.237
/8 thorugh /15 can be used with which class of networks?
Class A p. 239
/16 through /23 can only be used with which class of networks?
Class B p. 239
/24 through /30 can only be used with which class of networks?
Class C. p. 239
True or false: the broadcast address of a subnet is always the number right berfore the next subnet.
True
p. 246
True or false: A /30 Mask will provide a maximum of two hosts.
True. p. 248
If you ping and it fails, you must reinstall TCP/IP on the host?
True p. 257
What does the Packet InterNEt Groper (ping) DOS command do?
Uses an internet control message protocol ICMP ehco request and replies to test if a host IP stack is initialized and alive on the network. p .259
What does Traceroute DOS command do?
Displays the list of routers on a path to a network destination by susing Time to Live TTL, time outs and ICMP error messages. p. 259
What does a tracert DOS command do?
Same as tracerroute but it can be used for Microsoft. p. 259
What does the arp-a DOS command do?
Displays IP to MAC address mappings on a WIndows PC. p. 259
What does the ipconfig /all DOS command do?
Used only fro DOS prompt. It shows the PC network configuaration. p. 259
What are some advantages of implementing NAT?
Conserves legally regisgtered addresses p. 265
Reduces address overlap occurences
Increases flexability when connecting to the internet.
Eliminates address renumbering as the network changes.
What are some disadvantages of implementing NAT?
Translation introduces switching path delays
Loss of end to end IP traceability
DCertain appplications will not funciton with NAT enabled. p. 265
Name some types of NAT.
Static NAT (SNAT) Dynamic NAT (DNAT) Overloading
Describe Static NAT.
Designed to allow one to one mapping between local and global adresses. Each host must have an IP address with static NAT. p. 265
Describe Dynamic NAT (DNAT).
Has the ability to map an unregistered IP address to a registered IP address from a pool of registered IP addresses. p. 266
Describe overloading.
A form of dynamic NAT that maps multiple unregisted IP addresses to a single registed iP address by using different ports. p. 266
