python import yaml from ipaddress import ip_network, IPv4Network

1. Write the Python object "switches" to YAML format

switches = [ {"vendor": "cisco", "model": "2960", "ip": "10.0.0.1"}, {"vendor": "juniper", "model": "ex2200", "ip": "10.0.0.2"}, {"vendor": "cisco", "model": "3750", "ip": "10.0.0.3"} ]

yaml_data = yaml.dump(switches, allow_unicode=True) print(yaml_data)

2. Transform "switches" to keep only "cisco" switches

cisco_switches = [sw for sw in switches if sw.get('vendor') == 'cisco'] print(cisco_switches)

3. Use ipaddress to get the last host address in the "172.16.0.0/28" network

network = ip_network('172.16.0.0/28') last_host = list(network.hosts())[-1] print(last_host) # 172.16.0.14

4. Parse dhcp_snooping_table into a list of dictionaries

dhcp_snooping_table = [ "00:E9:8C:3F:A6:50 100.1.1.6 FastEthernet0/20", "00:E9:22:11:A6:50 100.1.1.7 FastEthernet0/21" ]

dhcp_snooping_table_parsed = [] for line in dhcp_snooping_table: mac, ip, interface = line.split() dhcp_snooping_table_parsed.append({"mac": mac, "ip": ip, "interface": interface})

print(dhcp_snooping_table_parsed)

5. Class NetworkSubnet

from ipaddress import IPv4Network

class NetworkSubnet: def init(self, aggregate_network: str): self.aggregate = IPv4Network(aggregate_network) self.available_subnets = [self.aggregate]

def get_subnet(self, length: int) -> IPv4Network:
    for i, subnet in enumerate(self.available_subnets):
        if subnet.prefixlen <= length and subnet.prefixlen <= length <= subnet.max_prefixlen:
            # Split the subnet into smaller ones
            subnets = list(subnet.subnets(new_prefix=length))
            if subnets:
                allocated = subnets[0]
                # Update the pool of available subnets
                # Remove the allocated subnet
                del self.available_subnets[i]
                # Add the remaining subnets
                self.available_subnets.extend(subnets[1:])
                return allocated
    raise ValueError(f"No available subnet with prefix length {length}")

def show_network_pool(self) -> list[IPv4Network]:
    return self.available_subnets

net = NetworkSubnet(aggregate_network="172.16.0.0/24") net_1 = net.get_subnet(length=26) print(f"{net_1=}") # IPv4Network('172.16.0.0/26') print(net.get_subnet(length=25)) # 172.16.0.64/25 or 172.16.0.128/25 depending on implementation print(net.get_subnet(length=30)) # 172.16.0.128/30 or another available subnet print(net.show_network_pool()) # List of remaining subnets """