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NETW204 Ch 06
VLSM and CIDR
| Question | Answer |
|---|---|
| Classful IP Addressing | In the early days of IPv4, IP addresses were divided into five classes, namely Class A, B, C, D, and E. |
| Contiguous | Consistent or adjacent. In terms of contiguous networks, the word contiguous means network blocks that are hierarchical in nature. |
| Discontiguous Address Assignment | A fragmented network assignment that does not follow a consistent pattern. |
| High-order Bits | The bit of a binary number that carries the most weight, the one written farthest to the left. High-order bits are the 1s in the network mask. |
| Network Prefix | Number of bits that defines the subnet mask. For example, the subnet mask 255.255.0.0 is a /16 prefix. |
| Prefix Aggregation | Also known as network summarization. Multiple IP addresses/IP prefixes can be summarized into a single IP prefix and announced to other routers as only the resulting less-specific prefix instead of the more specific IP addresses/prefixes that it covers. |
| Private Addressing | Addressing used for internal networks. Follows RFC 1918 addressing and not routable on the Internet. |
| Supernet | Aggregation of IP network addresses advertised as a single classless network address. For example, 192.0.8.0, 192.0.9.0, 192.0.10.0, 192.0.11.0, each with a 255.255.255.0 subnet mask, one can advertise the address 192.0.8.0 255.255.252.0 instead. |
| Supernetting | Combining several IP network addresses into one IP address. Supernetting reduces the number of entries in a routing table and is done in CIDR addressing as well as in internal networks. |
| RIPv1: VLSM or non-VLSM? | non-VLSM |
| EIGRP: VLSM or non-VLSM? | VLSM |
| IGRP: VLSM or non-VLSM? | non-VLSM |
| IS-IS: VLSM or non-VLSM? | VLSM |
| OSPF: VLSM or non-VLSM? | VLSM |
| RIPv2: VLSM or non-VLSM? | VLSM |
| Combining several IP network addresses in one IP address: VLSM or route summarization? | Route Summarization |
| Ability to specify a different subnet mask for the same network number and different subnets. VLSM or route summarization? | VLSM |
| Used in supernetting: VLSM or route summarization? | Route Summarization |
| Conserves address space: VLSM or route summarization? | VLSM |
| Used to reduce the number of entries in a routing table: VLSM or route summarization? | Route Summarization |
| What 2 methods allowed the continued use of IPv4 addressing and helped delay the need to implement IPv6? | Subnetting was variable-length & Private addresses were used with address translation (NAT) |
| 255.255.255.252 subnet mask range is best used for what scenario? | For point-to-point links, such as WAN connections. |
| 255.255.255.240 subnet mask range is best used for what scenario? | For small subnetworks with up to 14 hosts. |
| 255.255.255.192 subnet mask range is best used for what scenario? | For larger subnetworks with up to 62 hosts. |
| When using a classful Class A IP address scheme, how many octets are used to designate the network portion of the address? | 1 |
| 172.16.64.0/18 is appropriate for how many hosts? 2, 60, 250, 8000, or 16,000? | 16,000 |
| 172.16.16.64/30 is appropriate for how many hosts? 2, 60, 250, 8000, or 16,000? | 2 |
| 172.16.128.0/19 is appropriate for how many hosts? 2, 60, 250, 8000, or 16,000? | 8000 |
| 172.16.18.0/24 is appropriate for how many hosts? 2, 60, 250, 8000, or 16,000? | 250 |
| 172.16.5.128/26 is appropriate for how many hosts? 2, 60, 250, 8000, or 16,000? | 60 |
| How many bits are used in the IPv4 address space? | 32 bits, 8 bits in each octet (4 total) |
| 191.254.45.0: Class A or Class B address? | Class B |
| 123.90.78.45: Class A or Class B address? | Class A |
| 128.44.0.23: Class A or Class B address? | Class B |
| 129.68.11.45: Class A or Class B address? | Class B |
| 126.0.0.0: Class A or Class B address? | Class A |
| 125.33.23.56: Class A or Class B address? | Class A |
| What distinguishes a classless routing protocol from a classful routing protocol? | A classless routing protocol includes the subnet mask in the routing update. |
| What are the advantages of using a classless routing protocol? | Classless routing protocols allow the use of VLSM and CIDR within the routing domain. |
| How does a classful routing protocol determine the subnet mask of a routing update? | If the network address in the routing update is on the same major classful network as the receiving interface, the classful routing protocol will use the same mask as the interface; otherwise it will use the default classful mask. |
| Why did the IETF introduce classless IP addressing, CIDR? | The Internet routers' routing tables were experiencing very fast growth. There needed to be a way to summarize routes in the routing table. Because classful addressing only provided /8, /16, or /24 masks, the IPv4 address space was becoming depleted. |
| What term is used to define the process of subnetting a subnet? | Variable Length Subnet Masking |
Created by:
AZ4ME
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