 ```python
import secedemu

# Create emulator
emu = secedemu.Emulator(dump_file='emulation.dump')

# Create base layer
base_layer = emu.add_layer('base')
autonomous_systems = []
for i in range(5):
    asn = base_layer.add_autonomous_system(name=f'AS{i}')
    router = asn.add_router()
    network = asn.add_network(prefix='10.0.0.0/8')
    for j in range(3):
        host = asn.add_host()
        host.add_interface(network=network)
        router.add_interface(network=network)
    if i < 3:
        internet_exchange = base_layer.add_internet_exchange(name=f'IX{i}')
        router.add_interface(internet_exchange=internet_exchange)

# Add domain name caching service
dncs = []
for asn in autonomous_systems:
    dncs.append(asn.add_service('dncs'))
dncs[0].install(hosts=[dncs[0].autonomous_system.hosts[0]])
dncs[1].install(hosts=[dncs[1].autonomous_system.hosts[1]])
dncs[2].install(hosts=[dncs[2].autonomous_system.hosts[2]])
dncs[0].add_binding('8.8.8.8', '8.8.8.8')
dncs[1].add_binding('4.4.4.4', '4.4.4.4')
dncs[2].add_binding('1.1.1.1', '1.1.1.1')

# Create eBGP layer
ebgp_layer = emu.add_layer('ebgp')
for i in range(len(autonomous_systems)):
    for j in range(i+1, len(autonomous_systems)):
        ebgp_layer.add_private_peering(autonomous_systems[i].routers[0], autonomous_systems[j].routers[0])

# Add layers and domain name caching service to emulator
emu.add_layers([base_layer, dncs, ebgp_layer])

# Dump emulator state to binary file
emu.dump()
```