NETW-204 Assignment #3

Week 5

Refering to figure 1 below: You are the network administrator for the network depicted in the diagram. You have been assigned the address space 10.1.16.0/21 to create the LANs you need, and the 172.16.1.0/28 space for your WAN links.

LAN: 10.1.16.0/21

WAN: 172.16.1.0/28

LAN Subnets

Begin by creating and assigning the LAN subnets you will use. In order to make the most efficient use of your address space you should start by creating the subnet needed for the LAN with the most hosts and then work you down to the smallest LAN.

Using the address space 10.1.16.0/21, create subnets for the LANs shown in the diagram and fill in the table 1 below. Notice that the first 7 subnets are all basically the same size and all subnets are all factors of 2 (remember 2n-2 where n is the number of host bits tells you the subnet size). Also remember for the most efficient addressing you should use the smallest size subnet that provides you the needed number of hosts.

TABLE 1: (Questions 1-8)

Question LAN Subnet Address Subnet Mask

1. R1 LAN S3 10.1.16.0 255.255.255.0

2. R1 LAN S4 10.1.17.0 255.255.255.0

3. R2 LAN S5 10.1.18.0 255.255.255.0

4. R2 LAN S6 10.1.19.0 255.255.255.0

5. R3 LAN S7 10.1.20.0 255.255.255.0

6. R3 LAN S8 10.1.21.0 255.255.255.0

7. HQ LAN S1 10.1.22.0 255.255.255.0

8. HQ LAN S2 10.1.23.0 255.255.255.0

WAN Subnets

For the WAN links, you have been assigned the 172.16.1.0/28 address space. Fill in the subnets in Table 2 below by subnetting the assigned WAN space.

TABLE 2: (Questions 9-11)

Question WAN Subnet Address Subnet Mask

9. HQ-R1 172.16.1.0 255.255.255.252

10. HQ-R2 172.16.1.8 255.255.255.252

11. HQ-R3 172.16.1.8 255.255.255.252

Assign addresses

Use Table 3 below to document the IP addresses for the indicated interfaces following the guidelines below:

1. Assign the first IP address for all LANs to the router interface.

2. Assign HQ the first IP address for all WAN links to Branch routers.

Table 3: (Questions 13-27)

Device Interface Address Mask

13 HQ Router Fa0/0 10.1.22.1 255.255.255.0

14 Fa0/1 10.1.23.1 255.255.255.128

15 S0/0/0 209.165.201.2 255.255.255.252

16 S0/1/0 172.16.1.5 255.255.255.252

17 S0/0/1 172.16.1.1 255.255.255.252

18 R1 Router Fa0/0 10.1.16.1 255.255.255.0

19 Fa0/1 10.1.17.1 255.255.255.0

20 Bonus n/a n/a n/a

21 S0/0/0 172.16.1.2 255.255.255.252

22 R2 Router Fa0/0 10.1.18.1 255.255.255.0

23 Fa0/1 10.1.19.1 255.255.255.0

24 S0/0/0 172.16.1.6 255.255.255.252

25 R3 Router Fa0/0 10.1.20.1 255.255.255.0

26 Fa0/1 10.1.21.1 255.255.255.0

27 S0/0/0 172.16.1.10 255.255.255.252

EIGRP Metric Calculation

List the values used in the EIGRP composite metric to calculate the preferred path (4):

28 Delay

29 Reliability

30 Load

31 Bandwidth

Routing concepts

Question Answer

32 What is the default formula for the EIGRP composite metric? EIGRP Metric = 256*([K1*Bw + K2*Bw/(256-Load) + K3*Delay]*[K5/(Reliability + K4)])

33 What command can be used to view the current K value being used by EIGRP? Show interface

34 What command can be used to see the actual values of the EIGRP metric? Show interface

35 The _____________ metric is displayed in Kbps? bandwidth

36 The default value used by most serial interfaces is based on T1 connections and is______________bps? 1.544 MBPS

37 The measure of the probability a link will fail based on its history (downtime, errors) is referred to as

____________ and is measured with a value between 0 and 255. Reliability

38 ____________represents the amount of traffic using the link with a value between 0 and 255. Administrative distance

39 What is the main difference between a parent route and an ultimate route? how the default routes are processed / parent routes do not contain any next hop IP address or exit interface information

40 What is the relationship between parent and child routes? The parent maintains the subnet mask of the child route

41 Provide a brief description of a level 1 route: Level 1 routes can function as default routes, supernet routes, and network routes. They also have a subnet mask equal to or less than the classful mask of the network address.

42 What are the types of level one routes? ultimate route

DUAL Concepts

List at least 3 advantages that DUAL offers:

43 Loop free paths

44 Fast convergence

45 Uses a minimum of bandwidth with bounded updates

Dual Concept Definition

46 Successor the neighbor/peer with the lowest metric/distance to that network

47 Feasible distance (FD) The Feasible Distance is the metric of a network advertised by the connected neighbor plus the cost of reaching that neighbor

48 Feasible successor a router that has a least cost path to a network and therefore does not form part of a loop since the router will not choose a path that runs back through itself again

49 Feasibility condition (FC) Met when a neighbor’s RD is less than the local router’s FD to the same destination network

50 Reported Distance the total metric along a path to a destination network as advertised by an upstream neighbor

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