Chapter 8 Flashcards Preview

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Flashcards in Chapter 8 Deck (13):
1

what is a subnet masks?
236

it is a 32 bit value that allows the recipient of IP packets to distinguish the network ID portion of the IP address from the host ID portion of the IP address.

2

what is the largest subnet mask available?
237

/30 is the largest subnet mask available because we have to keep at least 2 bits for host bits.

3

/8 through /15 can be used only with class____network
239

A

4

/16 through /23 can be used in class __ and ___network
239

A and B

5

/24 through /30 can be used in class __ and ___and __ network.
239

A and B and C

6

when ping 127.0.0.1 fails what is the problem?
257

there is an IP stack failure and need to reinstall TCP/IP

7

when you ping the IP address of the host and it fails, what is the problem?
258

the problem is ion the NIC card.

8

when you ping the Default gateway and it fails, what is the problem?
258

any thing from NIC to the router.

9

what is NAT?
264

Short for Network Address Translation, an Internet standard that enables a local-area network (LAN) to use one set of IP addresses for internal traffic and a second set of addresses for external traffic

10

3 types of NAT, what are they?
265

static NAT ( SNAT)
dynamic NAT (DNAT)
Overloading

11

static NAT






266

A type of NAT in which a private IP address is mapped to a public IP address, where the public address is always the same IP address (i.e., it has a static address). This allows an internal host, such as a Web server, to have an unregistered (private) IP address and still be reachable over the Internet.

12

Dynamic NAT







266

Dynamic NAT translates a group of real addresses to a pool of mapped addresses that are routable on the destination network. The mapped pool may include fewer addresses than the real group. When a host you want to translate accesses the destination network, the ASA assigns the host an IP address from the mapped pool.

13

Overloading

NAT Overloading or Port Address Translation (PAT) is a modified form of dynamic NAT where the number of inside local addresses is greater than the number of inside global addresses. Mostly, there is just a single inside global IP address providing Internet access to all inside