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Question 41. What does the ACI pervasive gateway provide

1. Fibre Channel zoning
2. A consistent distributed default gateway
3. GPU scheduling
4. Server firmware updates

Correct Answer: 2. A consistent distributed default gateway

Explanation:

The Cisco ACI pervasive gateway provides the same default gateway address wherever a bridge domain is instantiated in the fabric. The gateway is distributed across the appropriate leaf switches rather than depending on one centralized routing device. This allows endpoints to move between leaf switches while continuing to use the same gateway information. Cisco configures the gateway through the subnet associated with the bridge domain. The distributed architecture reduces unnecessary traffic paths and supports efficient endpoint mobility throughout the fabric. It is an important feature of ACI Layer 3 forwarding design.

Question 42. What does an ACI preferred group allow

1. Automatic SAN zoning
2. GPU memory sharing
3. Automatic VXLAN removal
4. Communication between members without contracts

Correct Answer: 4. Communication between members without contracts

Explanation:

An ACI preferred group allows included endpoint groups or interfaces to communicate with other included members without requiring explicit contracts between every pair. This can simplify policy configuration when many trusted application groups need broad communication within the same VRF. Endpoint groups excluded from the preferred group continue to require contracts according to normal ACI policy rules. Cisco describes the preferred group as a way to simplify configuration while still retaining contract enforcement for traffic involving excluded groups. Designers should use it carefully because membership changes the normal default policy relationship between participating groups.

Question 43. What does vzAny represent in Cisco ACI

1. A collection of EPGs in a VRF
2. One physical leaf port
3. One storage target
4. One Fibre Channel VSAN

Correct Answer: 1. A collection of EPGs in a VRF

Explanation:

vzAny represents the collection of endpoint groups associated with a VRF. It allows administrators to apply contracts at the VRF level instead of creating many individual contract relationships between separate EPGs. This can simplify large policy designs and can reduce the amount of repetitive configuration required for common services. Cisco also describes designs where vzAny can redirect broad traffic flows to an external firewall while more specific contracts handle selected communications directly. The feature is therefore useful when many endpoint groups share a common policy requirement within the same routing domain.

Question 44. What is the purpose of an ACI service graph

1. Configure server UUIDs
2. Build SAN zones
3. Insert network services into a traffic path
4. Aggregate Ethernet links

Correct Answer: 3. Insert network services into a traffic path

Explanation:

A Cisco ACI service graph defines a sequence of network service functions that traffic must traverse between application groups. Common services include firewalls and application delivery controllers. The graph is associated with a contract and provides an abstract description of the required service path. APIC then renders the necessary forwarding relationships according to the configured service devices, bridge domains, and device selection policies. This approach separates application policy from the physical placement of the service appliance and can simplify replacement or modification of Layer 4 through Layer 7 devices.

Question 45. What does ACI Policy Based Redirect do

1. Assign server UUIDs
2. Redirect matching traffic to a service device
3. Select a UCS boot target
4. Create a VSAN

Correct Answer: 2. Redirect matching traffic to a service device

Explanation:

Policy Based Redirect steers selected ACI traffic toward a Layer 4 through Layer 7 service device such as a firewall. The redirection decision is based on policy information including the source group, destination group, and matching contract filter. This allows the service appliance to reside on a separate bridge domain instead of being physically placed directly in the normal forwarding path. Cisco identifies service graph redirect as a preferred service deployment approach on suitable newer Nexus platforms. PBR provides flexible service insertion without requiring every endpoint topology to be physically cabled through the service appliance.

Question 46. Which ACI service mode uses a transparent device

1. Go Through
2. Go To
3. One Arm only
4. VRF Lite

Correct Answer: 1. Go Through

Explanation:

Go Through mode is the Cisco ACI service graph mode used when a Layer 4 through Layer 7 appliance operates transparently between two bridge domains. In this design, the service device bridges traffic rather than acting as the Layer 3 routing point between the networks. Cisco also calls this transparent or bridged mode. The server default gateway remains elsewhere rather than being provided by the transparent appliance. Designers commonly use this model when inserting a firewall or similar service without changing the existing addressing and routing structure of the connected application networks.

Question 47. Which ACI service mode uses a routed service device

1. Go Through
2. Monitor
3. Sniffer
4. Go To

Correct Answer: 4. Go To

Explanation:

Go To mode is the Cisco ACI service graph model used when the Layer 4 through Layer 7 appliance performs routing between the relevant network segments. Cisco refers to this as routed mode. In a typical design, separate bridge domains are used for the client side and server side of the service device, and the service appliance participates directly in Layer 3 forwarding. The device can also become the server default gateway depending on the chosen topology. This model differs from Go Through mode, where the appliance operates transparently as a bridge.

Question 48. Which ACI service design commonly suits a load balancer with one interface

1. Go Through
2. Dual fabric SAN
3. One Arm
4. VRF Lite

Correct Answer: 3. One Arm

Explanation:

A one arm service design is commonly used when a load balancer connects through a single logical service interface. The load balancer resides on a dedicated bridge domain and typically uses source address translation or related traffic handling so requests and responses traverse the same interface. Cisco ACI supports one arm service graph designs and can also combine one arm deployment with policy based redirect in supported routed service configurations. This approach reduces the number of physical or logical interfaces required on the service appliance compared with designs that have separate client side and server side connections.

Question 49. Which ACI mechanism can avoid unknown unicast flooding

1. Hardware proxy
2. UUID pool
3. MAC pool
4. Boot policy

Correct Answer: 1. Hardware proxy

Explanation:

Cisco ACI bridge domains can use hardware proxy behavior instead of flooding every unknown unicast frame throughout the Layer 2 domain. With hardware proxy operation, leaf switches can forward unknown destination traffic toward the fabric spine proxy function so endpoint information can be resolved using the fabric endpoint database. This can reduce unnecessary flooding compared with traditional Layer 2 behavior. ACI bridge domain design allows administrators to choose appropriate unknown unicast forwarding behavior according to migration requirements and application characteristics. Network centric migrations sometimes use flooding when traditional network behavior must be preserved.

Question 50. What must every ACI bridge domain reference

1. A service graph
2. An external router
3. A Fibre Channel fabric
4. A VRF

Correct Answer: 4. A VRF

Explanation:

Every Cisco ACI bridge domain must have a relationship with a VRF. This requirement exists even when the bridge domain is intended to provide only Layer 2 connectivity and no ACI based routing. The VRF supplies the Layer 3 context within the ACI object model. Multiple bridge domains can reference the same VRF, allowing them to participate in the same routing domain when routing is enabled. Cisco specifically notes that a VRF must still be created and associated with a bridge domain in a pure Layer 2 network centric design.

Question 51. What happens to profiles created from an initial UCS service profile template when the template changes

1. They are deleted
2. They remain unchanged
3. They automatically reboot
4. They become updating templates

Correct Answer: 2. They remain unchanged

Explanation:

Service profiles created from an initial service profile template inherit the template settings when they are created, but they do not remain dynamically connected to later template changes. If the administrator subsequently changes the initial template, existing profiles created from that template retain their previous configuration. This behavior is useful when a common starting configuration is required but each resulting service profile may later evolve independently. Cisco contrasts initial templates with updating templates, where bound service profiles remain linked to the template and receive future changes.

Question 52. What happens to profiles bound to an updating UCS service profile template

1. They become independent immediately
2. They lose their identities
3. They receive template updates
4. They cannot use pools

Correct Answer: 3. They receive template updates

Explanation:

Service profiles created from an updating service profile template remain connected to that template. When administrators modify the updating template, those changes can propagate to the service profiles bound to it. This provides a powerful method for maintaining consistent server configuration at scale. Cisco recommends evaluating the impact of template changes because some modifications can require disruptive actions such as a server reboot. Updating templates are useful when organizations want a common server configuration to remain centrally controlled throughout the life of many service profiles rather than only during their initial creation.

Question 53. What identity does a UCS UUID pool provide

1. Ethernet VLAN numbers
2. Fibre Channel VSAN numbers
3. Switch domain IDs
4. Unique server UUID values

Correct Answer: 4. Unique server UUID values

Explanation:

A UCS UUID pool contains unique SMBIOS UUID values that can be assigned to servers through service profiles. The pool removes the need to manually select a UUID for each logical server and helps ensure that duplicate identities are not assigned. A portion of the UUID can be fixed while the variable suffix is allocated from the pool. Because the identity belongs to the service profile rather than being tied permanently to one physical server, the same logical server personality can be moved to compatible replacement hardware as part of the UCS stateless computing model.

Question 54. Which UCS resource pool provides addresses to vNICs

1. MAC pool
2. UUID pool
3. WWPN pool
4. IQN pool

Correct Answer: 1. MAC pool

Explanation:

A Cisco UCS MAC pool contains unique Layer 2 MAC addresses that can be assigned to server virtual network interface cards. The MAC pool is referenced by the vNIC configuration or vNIC template, which is then used by the service profile associated with the server. This central allocation model avoids manually assigning every vNIC address and makes server identity portable. When a service profile moves to compatible hardware, its network identity can move with it. Cisco recommends designing pools carefully so MAC addresses remain unique throughout the relevant Layer 2 environment.

Question 55. Which UCS pool provides Fibre Channel port identities for vHBAs

1. MAC pool
2. UUID pool
3. WWPN pool
4. IP pool

Correct Answer: 3. WWPN pool

Explanation:

A World Wide Port Name pool provides unique Fibre Channel port identities that Cisco UCS can assign to virtual host bus adapters. These identities are important because SAN zoning and storage access policies often reference WWPN values. Assigning WWPNs from centrally managed pools allows the Fibre Channel identity to belong to the service profile rather than being permanently tied to physical server hardware. Cisco distinguishes WWPN pools from WWNN pools. WWPNs identify individual Fibre Channel ports, while a WWNN represents the Fibre Channel node identity associated with the server.

Question 56. What does a UCS vHBA template define

1. Ethernet routing
2. SAN connectivity for a vHBA
3. AP radio behavior
4. ACI contract scope

Correct Answer: 2. SAN connectivity for a vHBA

Explanation:

A vHBA template defines how a virtual host bus adapter connects to the storage network. Cisco also refers to it as a SAN connectivity template. The template can reference resources such as VSANs, WWPN pools, SAN pin groups, and related operational policies. Once the template is included in a service profile, the server receives the required virtual Fibre Channel adapter configuration consistently. Templates reduce repetitive configuration and help standardize SAN connectivity across groups of servers. They are especially useful when many hosts require similar storage access characteristics.

Question 57. What does a UCS boot policy control

1. ACI endpoint learning
2. Fibre Channel zoning rules
3. Ethernet congestion marking
4. Server boot device order

Correct Answer: 4. Server boot device order

Explanation:

A Cisco UCS boot policy defines the devices and sequence a server uses when attempting to start its operating system. Boot options can include local storage, SAN boot targets, LAN boot, virtual media, and iSCSI depending on the server design. Applying boot configuration through a reusable policy ensures that multiple service profiles receive consistent startup behavior. This is particularly important in stateless server architectures where a service profile may move to replacement hardware and still needs to locate the same intended operating system or boot target without manual reconfiguration.

Question 58. What does a UCS maintenance policy primarily control

1. SAN zoning
2. How disruptive server changes are applied
3. VXLAN identifiers
4. GPU memory allocation

Correct Answer: 2. How disruptive server changes are applied

Explanation:

A Cisco UCS maintenance policy determines how configuration changes that require disruptive server actions are handled. Certain service profile modifications can require a server reboot or similar interruption before they take effect. The maintenance policy can determine whether the action occurs automatically or waits for user acknowledgement. This helps administrators prevent unexpected outages when centrally managed policies or templates are modified. Maintenance policy design is particularly important when updating service profile templates because a change to one updating template can affect many bound servers simultaneously and may create a significant operational impact.

Question 59. What does FCoE transport over Ethernet

1. Fibre Channel frames
2. VXLAN control messages only
3. GPU instructions
4. ACI contracts

Correct Answer: 1. Fibre Channel frames

Explanation:

Fibre Channel over Ethernet allows Fibre Channel storage traffic to traverse an Ethernet physical network. This provides converged input and output so normal Ethernet data and storage traffic can share suitable Ethernet infrastructure while maintaining Fibre Channel services and behavior. Cisco explains that FCoE depends on enhancements to Ethernet that provide the reliability needed for storage networking. Data Center Bridging technologies such as Priority Flow Control, Enhanced Transmission Selection, and Data Center Bridging Exchange are important supporting mechanisms. FCoE can reduce the number of separate adapters and physical connections required at the server.

Question 60. Which feature provides lossless Ethernet behavior for FCoE traffic

1. LACP
2. STP
3. Priority Flow Control
4. VRF Lite

Correct Answer: 3. Priority Flow Control

Explanation:

Priority Flow Control provides the lossless Ethernet behavior required by Fibre Channel over Ethernet. It can pause a selected traffic priority when congestion occurs instead of dropping FCoE frames. Unlike traditional Ethernet pause behavior, PFC operates per priority so other traffic classes can continue using the link. Cisco identifies PFC as one of the key Data Center Bridging technologies that enable FCoE. Enhanced Transmission Selection and Data Center Bridging Exchange provide additional bandwidth management and capability exchange functions. Proper PFC design is important because uncontrolled pause propagation can negatively affect other traffic in a converged network.