COA Networking and Storage Configuration 3 — Questions and Answers
Question 1: Which command displays all Neutron agents running in the deployment and their alive status?
- neutron agent-list
- openstack network agent list (Correct answer)
- openstack agent show --all
- neutron net-list --agents
Correct answer: openstack network agent list
openstack network agent list is the unified CLI command that shows all Neutron agents with their host, type, and alive flag.
Question 2: In Swift, what is the maximum recommended size of a single object before it should be split into a large object?
- 1 GB
- 5 GB (Correct answer)
- 10 GB
- 100 MB
Correct answer: 5 GB
Swift recommends splitting objects larger than 5 GB into segments using Static or Dynamic Large Object support.
Question 3: Which Cinder option configures the minimum free space percentage that must remain on a storage backend before it stops accepting new volumes?
- reserved_percentage (Correct answer)
- max_over_subscription_ratio
- volume_clear
- lvm_type
Correct answer: reserved_percentage
reserved_percentage tells Cinder to keep that fraction of backend capacity free and report it as unavailable for scheduling.
Question 4: What Neutron feature allows a single physical network interface to carry multiple tenant networks using 802.1Q tags?
- VXLAN segmentation
- VLAN provider network (Correct answer)
- GRE tunneling
- Flat network
Correct answer: VLAN provider network
VLAN provider networks use 802.1Q tagging to isolate multiple tenant networks over one physical interface.
Question 5: Which command attaches a Cinder volume to a running Nova instance using the OpenStack CLI?
- openstack server add volume <server> <volume> (Correct answer)
- openstack volume attach <volume> --server <server>
- cinder attach --instance <server> <volume>
- nova volume-attach <server> <volume> auto
Correct answer: openstack server add volume <server> <volume>
openstack server add volume <server> <volume> triggers the Nova compute API to attach the Cinder volume to the specified instance.
Question 6: Which Neutron ML2 mechanism driver is commonly used with Open vSwitch for overlay networks?
- linuxbridge
- openvswitch (Correct answer)
- macvtap
- sriovnicswitch
Correct answer: openvswitch
The openvswitch ML2 mechanism driver integrates with the OVS agent to provide VXLAN/GRE overlay and VLAN networks.
Question 7: In Ceph-backed Cinder, which CRUSH rule parameter determines how replicas are distributed across failure domains?
- rbd_pool
- rbd_secret_uuid
- crush_rule (Correct answer)
- rbd_ceph_conf
Correct answer: crush_rule
crush_rule specifies the CRUSH rule name or ID that controls replica placement across OSDs, hosts, or racks.
COA Networking and Storage Configuration 3
Which command displays all Neutron agents running in the deployment and their alive status?