Cisco Implementing Cisco Application Centric Infrastructure (DCACI) 300-620 certification exam practice question and answer (Q&A) dump with detail explanation and reference available free, helpful to pass the Cisco DCACI 300-620 exam and earn Cisco Implementing Cisco Application Centric Infrastructure (DCACI) 300-620 certification.
Question
Exam Question
Which two protocols are used for fabric discovery in ACI? (Choose two.)
A. LLDP
B. OSPF
C. CDP
D. DHCP
E. ISIS
Correct Answer
A. LLDP
D. DHCP
Explanation 1
According to Infraexam.com, Link-Layer Discovery Protocol (LLDP) and Dynamic Host Configuration Protocol (DHCP) are protocols that are used to bring up a Cisco Application Centric Infrastructure (ACI) fabric in a cascading manner.
Therefore, the correct answers are A and D.
Explanation 2
The two protocols used for fabric discovery in ACI are LLDP and DHCP. LLDP is used for neighbor discovery while DHCP is used for assigning the infrastructure VXLAN tunnel endpoint (VTEP) addresses and installing firmware on the switches.
Explanation 3
Fabric discovery in ACI is the process of connecting and registering the ACI switches to the APIC controllers. Fabric discovery relies on LLDP packets that contain information such as the infra VLAN and the role of the device. Fabric discovery also uses DHCP to assign IP addresses from the TEP pool to the registered switches. Therefore, the two protocols that are used for fabric discovery in ACI are A. LLDP and D. DHCP.
Explanation 4
The two protocols used for fabric discovery in ACI (Application Centric Infrastructure) are:
A. LLDP (Link Layer Discovery Protocol): LLDP is used for discovering neighboring devices and exchanging basic information about the network topology. It helps ACI switches and devices identify each other and establish communication within the fabric.
C. CDP (Cisco Discovery Protocol): CDP is a Cisco proprietary protocol used for discovering and gathering information about neighboring Cisco devices. While ACI is not limited to Cisco devices only, CDP can still be utilized for fabric discovery within an ACI deployment.
Therefore, options A (LLDP) and C (CDP) are the correct answers for the protocols used for fabric discovery in ACI.
Explanation 5
One of the steps involved in preparing the ACI fabric infrastructure is fabric discovery, which allows the APIC to automatically detect and configure the fabric switches. Fabric discovery relies on two protocols: LLDP and DHCP.
LLDP is used for neighbor discovery, which helps the APIC identify the topology and role of each switch in the fabric.
DHCP is used for IP address assignment, which assigns a unique tunnel endpoint (TEP) IP address to each switch for VXLAN communication.
Other protocols, such as ISIS, CDP, OSPF, and ISIS, are used for different purposes in the ACI fabric, such as routing, certification validation, and tunnel setup.
Explanation 6
The correct answers are A and E.
The Cisco Application Centric Infrastructure (ACI) uses the Link Layer Discovery Protocol (LLDP) and the Intermediate System to Intermediate System (IS-IS) routing protocol for fabric discovery.
LLDP is a link layer protocol that is used to discover the topology of a network. It is a vendor-neutral protocol that is supported by most network devices.
IS-IS is a routing protocol that is used to exchange routing information between routers. It is a link-state routing protocol that is similar to OSPF.
ACI uses LLDP to discover the topology of the fabric and IS-IS to exchange routing information between the leaf and spine switches.
Answers B, C, and D are incorrect because they are not used for fabric discovery in ACI.
Explanation 7
The correct answers are A and E.
LLDP (Link Layer Discovery Protocol) and ISIS (Intermediate System to Intermediate System) are the two protocols used for fabric discovery in ACI.
LLDP is a link layer protocol that allows devices to advertise their capabilities and neighbors. This information is used by the APIC to build a topology of the fabric.
ISIS is an interior gateway protocol that is used to distribute routing information within a domain. The APIC uses ISIS to distribute the fabric routing information to the leaf switches.
The other protocols listed are not used for fabric discovery in ACI.
- OSPF (Open Shortest Path First) is an interior gateway protocol that is used to distribute routing information within a domain. However, it is not used by the APIC for fabric discovery.
- CDP (Cisco Discovery Protocol) is a Cisco proprietary protocol that is used to discover neighboring Cisco devices. However, it is not used by the APIC for fabric discovery.
- DHCP (Dynamic Host Configuration Protocol) is a protocol that is used to assign IP addresses to devices. However, it is not used by the APIC for fabric discovery.
Explanation 8
The correct answers are A and E.
The two protocols used for fabric discovery in ACI are Link Layer Discovery Protocol (LLDP) and Intermediate System to Intermediate System (IS-IS). LLDP is a vendor-neutral protocol that is used to discover devices on a network. IS-IS is a routing protocol that is used to exchange routing information between routers.
ACI uses LLDP to discover the topology of the fabric. LLDP is a Layer 2 protocol that is used to discover the topology of a network. LLDP is used by ACI to discover the topology of the fabric and to identify the devices that are connected to the fabric.
ACI uses IS-IS to exchange routing information between the leaf switches and the spine switches. IS-IS is a Layer 3 protocol that is used to exchange routing information between routers. IS-IS is used by ACI to exchange routing information between the leaf switches and the spine switches.
The other options are incorrect because they are not used for fabric discovery in ACI. OSPF is a routing protocol that is used to exchange routing information between routers. CDP is a Cisco proprietary protocol that is used to discover devices on a network. DHCP is a protocol that is used to assign IP addresses to devices on a network.
Reference
- Cisco Application Centric Infrastructure Fundamentals, Release 5.2(x) – Forwarding Within the ACI Fabric [Cisco Application Policy Infrastructure Controller (APIC)] – Cisco
- Cisco Application Centric Infrastructure Fundamentals, Release 3.x and Earlier – Fabric Provisioning [Cisco Application Policy Infrastructure Controller (APIC)] – Cisco
- ACI Fabric – Underlying protocols – Cisco Community
- Cisco Application Centric Infrastructure Fundamentals, Release 5.2(x) – Fabric Provisioning [Cisco Application Policy Infrastructure Controller (APIC)] – Cisco
- Troubleshoot ACI Fabric Discovery – Initial Fabric Setup – Cisco
- [GUIDE_BY_TAC] Fabric Discovery Troubleshooting: Discovering the First Leaf Switch in ACI – Cisco Community
