Boost Your Grades with Expert Solutions from a Computer Network Assignment Helper

At computernetworkassignmenthelp.com, we understand the challenges students face when tackling complex computer network assignments. Our team of experts is here to provide you with the assistance you need to excel in your studies. As a premier Computer Network Assignment Helper, we offer top-notch solutions to intricate problems, ensuring you grasp the concepts and secure excellent grades. Below, we present a couple of master-level computer network questions, complete with comprehensive solutions crafted by our experts. Understanding Subnetting and Network Design Subnetting is a crucial concept in computer networking that involves dividing a larger network into smaller, more manageable sub-networks, or subnets. This practice improves network performance and security while optimizing the use of IP addresses. Let's dive into a typical subnetting scenario and explore the solution provided by our experts. Scenario: You are given a network address of 192.168.1.0/24 and tasked with creating six subnets, each accommodating at least 25 hosts. Provide the subnet masks, subnet addresses, and the range of IP addresses for each subnet. Solution: To solve this problem, we need to determine the appropriate subnet mask and the configuration for each of the six subnets. 1. Determine the Subnet Mask: - The original network has a /24 prefix, indicating 255.255.255.0 as the subnet mask. - To accommodate at least 25 hosts per subnet, we need at least 5 bits for the host part (since 2^5 - 2 = 30 hosts). - This means we can borrow 3 bits from the host portion for the subnetting (since 2^3 = 8 subnets). Therefore, the new subnet mask will be 255.255.255.224 (or /27). 2. Calculate the Subnet Addresses: - The increment for each subnet is 32 (since 256 - 224 = 32). Here are the subnet addresses and their ranges: - Subnet 1: 192.168.1.0/27 - Range: 192.168.1.1 to 192.168.1.30 - Broadcast: 192.168.1.31 - Subnet 2: 192.168.1.32/27 - Range: 192.168.1.33 to 192.168.1.62 - Broadcast: 192.168.1.63 - Subnet 3: 192.168.1.64/27 - Range: 192.168.1.65 to 192.168.1.94 - Broadcast: 192.168.1.95 - Subnet 4: 192.168.1.96/27 - Range: 192.168.1.97 to 192.168.1.126 - Broadcast: 192.168.1.127 - Subnet 5: 192.168.1.128/27 - Range: 192.168.1.129 to 192.168.1.158 - Broadcast: 192.168.1.159 - Subnet 6: 192.168.1.160/27 - Range: 192.168.1.161 to 192.168.1.190 - Broadcast: 192.168.1.191 By creating these subnets, you have successfully divided the 192.168.1.0/24 network into six subnets, each with enough IP addresses to support at least 25 hosts. Exploring Network Security with Access Control Lists (ACLs) Access Control Lists (ACLs) are vital for securing a network by controlling the traffic that is allowed or denied based on specified criteria. This is especially important in protecting sensitive resources and ensuring that only authorized users have access. Scenario: You need to configure an ACL on a router to block HTTP traffic from the 192.168.10.0/24 network to the 192.168.20.0/24 network, while allowing all other traffic. Solution: To achieve this, we will create an extended ACL that specifies the conditions for blocking HTTP traffic while permitting other types of traffic. 1. Define the ACL: - Extended ACLs can filter traffic based on both source and destination IP addresses, as well as specific protocols and ports. ``` Router(config)# access-list 100 deny tcp 192.168.10.0 0.0.0.255 192.168.20.0 0.0.0.255 eq 80 Router(config)# access-list 100 permit ip any any ``` 2. Apply the ACL to the Appropriate Interface: - The ACL must be applied to the interface closest to the source network to prevent unwanted traffic from entering the network. ```plaintext Router(config)# interface g0/0 Router(config-if)# ip access-group 100 in ``` Explanation: - The first command defines ACL 100, which denies any TCP traffic (protocol used by HTTP) from the source network 192.168.10.0/24 to the destination network 192.168.20.0/24 on port 80 (HTTP). - The second command permits all other IP traffic. - Finally, the ACL is applied inbound on the interface connected to the 192.168.10.0/24 network. Advanced Network Configuration with VLANs Virtual Local Area Networks (VLANs) are used to segment a physical network into multiple logical networks, improving performance and security. VLANs can isolate broadcast domains, reduce congestion, and enhance network management. Scenario: You are tasked with configuring VLANs on a switch to separate the marketing, sales, and IT departments. The marketing VLAN should use VLAN ID 10, the sales VLAN should use VLAN ID 20, and the IT VLAN should use VLAN ID 30. Solution: To configure the VLANs, follow these steps: 1. Create the VLANs: - Use the switch's CLI to create and name each VLAN. ```plaintext Switch(config)# vlan 10 Switch(config-vlan)# name Marketing Switch(config-vlan)# exit Switch(config)# vlan 20 Switch(config-vlan)# name Sales Switch(config-vlan)# exit Switch(config)# vlan 30 Switch(config-vlan)# name IT Switch(config-vlan)# exit ``` 2. Assign Ports to VLANs: - Assign specific switch ports to each VLAN based on the department's physical location. ```plaintext Switch(config)# interface range g0/1 - 10 Switch(config-if-range)# switchport mode access Switch(config-if-range)# switchport access vlan 10 Switch(config)# interface range g0/11 - 20 Switch(config-if-range)# switchport mode access Switch(config-if-range)# switchport access vlan 20 Switch(config)# interface range g0/21 - 30 Switch(config-if-range)# switchport mode access Switch(config-if-range)# switchport access vlan 30 ``` 3. Configure Trunk Ports: - Set up trunk ports to allow traffic from multiple VLANs to pass through to other switches or the router. ```plaintext Switch(config)# interface g0/48 Switch(config-if)# switchport mode trunk Switch(config-if)# switchport trunk allowed vlan 10,20,30 ``` Explanation: - VLANs 10, 20, and 30 are created and named Marketing, Sales, and IT, respectively. - Ports g0/1 to g0/10 are assigned to the Marketing VLAN (VLAN 10), ports g0/11 to g0/20 to the Sales VLAN (VLAN 20), and ports g0/21 to g0/30 to the IT VLAN (VLAN 30). - Port g0/48 is configured as a trunk port to carry traffic from all three VLANs. Integrating Network Security Protocols Securing a network involves more than just configuring ACLs; it requires implementing various security protocols to protect data in transit. Let's explore how to configure IPsec for secure communication between two routers. Scenario: You need to establish a secure IPsec VPN between two routers to encrypt traffic between the 10.1.1.0/24 and 10.2.2.0/24 networks. Solution: 1. Configure the ISAKMP Policy: - Define the Internet Security Association and Key Management Protocol (ISAKMP) policy for key exchange. ```plaintext Router1(config)# crypto isakmp policy 10 Router1(config-isakmp)# encryption aes Router1(config-isakmp)# hash sha Router1(config-isakmp)# authentication pre-share Router1(config-isakmp)# group 5 Router1(config-isakmp)# lifetime 3600 Router2(config)# crypto isakmp policy 10 Router2(config-isakmp)# encryption aes Router2(config-isakmp)# hash sha Router2(config-isakmp)# authentication pre-share Router2(config-isakmp)# group 5 Router2(config-isakmp)# lifetime 3600 ``` 2. Configure the Pre-Shared Key: - Set the pre-shared key for authentication between the routers. ```plaintext Router1(config)# crypto isakmp key mysecurekey address 192.168.1.2 Router2(config)# crypto isakmp key mysecurekey address 192.168.1.1 ``` 3. Define the IPsec Transform Set: - Specify the IPsec transform set, which defines how traffic is encrypted and authenticated. ```plaintext Router1(config)# crypto ipsec transform-set MYSET esp-aes esp-sha-hmac Router2(config)# crypto ipsec transform-set MYSET esp-aes esp-sha-hmac ``` 4. Create the Crypto Map: - Map the transform set to the specific traffic that should be encrypted. ```plaintext Router1(config)# crypto map MYMAP 10 ipsec-isakmp Router1(config-crypto-map)# set peer 192.168.1.2 Router1(config-crypto-map)# set transform-set MYSET Router1(config-crypto-map)# match address 101 Router2(config)# crypto map MYMAP 10 ipsec-isakmp Router2(config-crypto-map)# set peer 192.168.1.1 Router2(config-crypto-map)# set transform-set MYSET Router2(config-crypto-map)# match address 101 ``` 5. Apply the Crypto Map to the Interfaces: - Bind the crypto map to the outgoing interface on each router. ``` Router1(config)# interface g0/0 Router1(config-if)# crypto map MYMAP Router2(config)# interface g0/0 Router2(config-if)# crypto map MYMAP ``` Explanation: - An ISAKMP policy is configured on both routers to use AES for encryption, SHA for hashing, pre-shared keys for authentication, and a Diffie-Hellman group 5. - A pre-shared key is defined for mutual authentication. - The IPsec transform set specifies AES for encryption and SHA for integrity. - A crypto map is created to define the IPsec peer, the transform set, and the access control list (ACL) that identifies the traffic to be encrypted. - Finally, the crypto map is applied to the outgoing interface on both routers. Conclusion As demonstrated, solving advanced computer network problems requires a deep understanding of various networking concepts and the ability to apply them effectively. At https://www.computernetworkassignmenthelp.com/, our experts are equipped to handle such challenges and provide you with high-quality solutions that enhance your learning and academic performance. Whether you need assistance with subnetting, VLAN configuration, ACL setup, or securing networks with IPsec, our team is here to help you every step of the way. Trust us as your go-to Computer Network Assignment Helper and take the first step towards mastering your network assignments today.