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질문 # 16
You are asked to deploy 100 QFX Series devices using ZTP Each OFX5120 requires a different configuration. In this scenario, what are two components that you would configure on the DHCP server?
(Choose two.)
정답：B,D
설명：
* Zero Touch Provisioning (ZTP):
* ZTP allows for the automated configuration of network devices, like QFX Series switches, without manual intervention. During ZTP, a switch will obtain its configuration from a DHCP server and then download the required software and configuration files from a specified server (e.
g., FTP, HTTP).
* DHCP Server Configuration:
* Option B:The DHCP server needs to know theMAC address for each QFX5120to provide a specific configuration based on the device identity. By mapping the MAC address to a particular configuration, the DHCP server can ensure that each switch gets the correct configuration.
* Option D:Themanagement IP address for each QFX5120must also be assigned by the DHCP server. This IP address allows the device to communicate on the network and access the configuration files and other required resources during the ZTP process.
Conclusion:
* Option B:Correct-MAC addresses allow the DHCP server to identify each QFX5120 and assign the appropriate configuration.
* Option D:Correct-Management IP addresses are essential for network communication during ZTP.
질문 # 17
You are asked to identify microburst traffic occurring in the network leading to packet drops in your data center switches.
Which two tools would be used in this scenario? (Choose two.)
정답：B,D
설명：
port buffer monitoring: Port buffer monitoring is an effective tool for detecting microbursts in network traffic. By monitoring buffer utilization on the switch ports, you can identify periods of high congestion where the buffer might overflow, leading to packet drops. This allows you to observe when and where traffic is overwhelming the port buffers, which is a typical sign of microbursts.
port mirroring: Port mirroring allows you to capture the traffic on a specific port or set of ports and send it to a monitoring device for analysis. This can be useful for identifying microburst traffic, as it allows you to analyze the traffic patterns and volume to determine if short bursts of traffic are causing packet drops on the network.
질문 # 18
Click the Exhibit button.
Referring to the exhibit, which two statements are correct? (Choose two.)
정답：B,D
설명：
The leaf switches function as VTEPs: they encapsulate customer Layer 2 frames into VXLAN over the routed IP underlay, which then forwards the packets based on the outer IP header.
When the VXLAN packet reaches the destination leaf, that leaf decapsulates the VXLAN header and forwards the original Layer 2 frame toward the attached server, preserving the original source and destination MAC addresses.
질문 # 19
You must integrate several leaf nodes that do not support the EVPN-VXLAN architecture into your existing EVPN-VXLAN-based IP fabric. In this scenario, which two design considerations would accomplish this task? (Choose two.)
정답：C,D
설명：
Edge-routed bridging allows integrating devices that are not EVPN-VXLAN capable by extending Layer 2 at the edge while using routing toward the fabric, enabling those leaves to connect without participating in the EVPN control plane. A collapsed fabric design can place overlay functions on a subset of capable devices while keeping other leaf nodes operating as simpler routed/bridged nodes, allowing coexistence within the same fabric.
질문 # 20
A local VTEP has two ECMP paths to a remote VTEP
Which two statements are correctwhen load balancing is enabled in this scenario? (Choose two.)
정답：A,C
설명：
* Load Balancing in VXLAN:
* VXLAN uses UDP encapsulation to transport Layer 2 frames over an IP network. For load balancing across Equal-Cost Multi-Path (ECMP) links, various fields in the packet can be used to ensure even distribution of traffic.
* Key Load Balancing Fields:
* C. The source port in the UDP header is used to load balance VXLAN traffic:This is correct.
The source UDP port in the VXLAN packet is typically calculated based on a hash of the inner packet's fields. This makes the source port vary between packets, enabling effective load balancing across multiple paths.
* D. The inner packet fields are used in the hash for load balancing:This is also correct. Fields such as the source and destination IP addresses, source and destination MACaddresses, and possibly even higher-layer protocol information from the inner packet can be used to generate the hash that determines the ECMP path.
* Incorrect Statements:
* A. The inner packet fields are not used in the hash for load balancing:This is incorrect as the inner packet fields are indeed critical for generating the hash used in load balancing.
* B. The destination port in the UDP header is used to load balance VXLAN traffic:This is incorrect because the destination UDP port in VXLAN packets is typically fixed (e.g., port 4789 for VXLAN), and therefore cannot be used for effective load balancing.
Data Center References:
* Effective load balancing in VXLAN is crucial for ensuring high throughput and avoiding congestion on specific links. By using a combination of the source UDP port and inner packet fields, the network can distribute traffic evenly across available paths.
질문 # 21
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