Table of Contents
Which routing protocol can use VLSM?
VLSM is supported by the following protocols: Open Shortest Path First (OSPF), Enhanced Interior Gateway Router Protocol (EIGRP), Border Gateway Protocol (BGP), Routing Information Protocol (RIP) version 2 and 3, and Intermediate System-to-Intermediate System (IS-IS).
What is the benefit of using VLSM?
VLSM provides many benefits for real networks, mainly related to how you allocate and use your IP address space. Because a mask defines the size of the subnet (the number of host addresses in the subnet), VLSM allows engineers to better match the need for addresses with the size of the subnet.
How does VLSM help route summarization?
With VLSM, you break a block of addresses into smaller subnets; in route summarization, a group of subnets is rolled up into a summarized routing table entry.
How do I choose the best routing protocol for my network?
Choosing the Best Routing Protocol | CCDA
- Metric (it may be hop count or bandwidth)
- Amount of Traffic.
- Network Size.
- VLSM support.
- Redundancy.
What does VLSM stand for why is it used and what shortcomings does it help resolve on a network?
Variable Length Subnet Mask
Variable Length Subnet Mask (VLSM) is a subnet — a segmented piece of a larger network — design strategy where all subnet masks can have varying sizes. This process of “subnetting subnets” enables network engineers to use multiple masks for different subnets of a single class A, B or C network.
What is the main purpose of VLSM quizlet?
What is the purpose of the Variable Length Subnet Masking (VLSM)? Using the subnet mask to further divide up the address space in a class C to tailor networks to our specific circumstances and avoid wasting IP address space.
What is VLSM Why do we need this explanation with at least two examples?
Subnetting charts Before we take the examples of VLSM Subnetting, let’s build Subnetting chart for each IP class. Subnetting charts summarize all possible combinations of all Subnetting bits in all IP classes.
What is the purpose of route summarization?
Route summarization — also known as route aggregation — is a method to minimize the number of routing tables in an IP network. It consolidates selected multiple routes into a single route advertisement. This differentiates it from flat routing, in which every routing table carries a unique entry for each route.
Why routing protocols are used?
A routed protocol is used to deliver application traffic. It provides appropriate addressing information in its internet layer or network layer to allow a packet to be forwarded from one network to another. Examples of routed protocols are the Internet Protocol (IP) and Internetwork Packet Exchange (IPX).
What are the disadvantages of VLSM?
Some of the disadvantages of VLSM are as follows: It is easy to make mistakes in address assignment, so double-check your calculations before deploying them. It is more confusing and difficult to monitor your network with all the new subnets.
What are the major advantages of VLSM subnetting over fixed length subnetting?
The biggest advantage of VLSM Subnetting is that, instead of forcing us to use a fixed size for all segments, it allows us to choose the individual size for each segment. This flexibility reduces the IP wastage. We can choose the size of subnet which closely matches with our requirement.
What is the advantage of using a VLSM?
This approach is particularly important when using VLSMs. A VLSM design allows for maximum use of IP addresses, as well as more efficient routing update communication when using hierarchical IP addressing. In Figure 3-35, for example, route summarization occurs at two levels.
Which routing protocols work with VLSM?
Only routing protocols that ignore the rules of address class and use classless prefixes work properly with VLSM. Table 2-6 lists common classful and classless routing protocols.
Why can’t I use the /30 network with VLSM?
The problem arises when the routing protocols are configured: Prior to VLSM, the /30 networks could not be used because the /26 networks existed in the same system and the classful routing protocols could only advertise one mask per class of address. All networks, including the little /30 links, had to use the same mask of /26.
What is a variable VLSM subnet?
VLSM is a subnet design strategy that allows all subnet masks to have variable sizes. In VLSM subnetting, network administrators can divide an IP address space into subnets of different sizes, and allocate it according to the individual need on a network. This type of subnetting makes more efficient use of a given IP address range.