What are two best practices when designing a campus Layer 3 infrastructure? (Choose two.)
What are two best practices when designing a campus Layer 3 infrastructure? (Choose two.)
When designing a campus Layer 3 infrastructure, summarizing routes from the aggregation layer toward the core layer is critical to optimize route management and improve network performance. This helps in reducing the size of routing tables and enhances convergence times. Fine-tuning Cisco Express Forwarding load balancing for Equal Cost Multipath (ECMP) routing is another best practice. ECMP allows multiple paths for data to traverse the network, and fine-tuning this mechanism ensures efficient distribution of traffic, thereby optimizing network performance and resource utilization.
We should not implement security features at the core as it would reduce the speed in this layer -> Answer B is not correct. It is a recommended practice to configure summarization in a large network from the distribution layers toward the core. Implementing summarization at the distribution layer optimizes the convergence process -> Answer C is correct while answer E is not correct. Reference: https://www.ccexpert.us/network-design/route-summarization.html Also in the above link, it is recommended to configure “Passive Interfaces for IGP at the Access Layer”, not “nontransit links” which makes answer A to be not correct. “As a best practice for ECMP-based Layer 3 networks, Cisco recommends fine-tuning Cisco Express Forwarding load balancing to include Layer 3 and Layer 4 tuple inclusion to compute and derive the first phase of the optimal forwarding decision process between two upstream Layer 3 MEC interfaces.” -> Answer D is correct. Reference: https://www.cisco.com/c/dam/global/shared/assets/pdf/cisco_enterprise_campus_infrastructure_design_guide.pdf
CD are correct https://www.ciscopress.com/articles/article.asp?p=1315434&seqNum=3
As a best practice for ECMP-based Layer 3 networks, Cisco recommends fine-tuning Cisco Express Forwarding load balancing to include Layer 3 and Layer 4 tuple inclusion to compute and derive the first phase of the optimal forwarding decision process between two upstream Layer 3 MEC interfaces.
C, D is correct. https://www.ciscolive.com/c/dam/r/ciscolive/apjc/docs/2019/pdf/BRKCRS-2031.pdf A is incorrect. "Only peer on links that you intend to use as transit" cisco said. In pdf p42, the link are used for L2 transit but configured passive-interface.
Could be A,C or D - hopefully Cisco give credit for all three in the exam. https://www.cisco.com/c/dam/global/shared/assets/pdf/cisco_enterprise_campus_infrastructure_design_guide.pdf
https://www.cisco.com/c/dam/global/shared/assets/pdf/cisco_enterprise_campus_infrastructure_design_guide.pdf Block OSPF neighbor processing with passive-mode configuration on physical or logical interfaces connected to non-EIGRP devices in the network, such as PCs, wireless LAN controllers, and so on. This best practice helps reduce CPU utilization and secures the network with unprotected OSPF adjacencies with untrusted devices I think A,C could be the correct answer.
agree with C D. https://www.cisco.com/c/dam/global/shared/assets/pdf/cisco_enterprise_campus_infrastructure_design_guide.pdf
C & D are correct https://www.ciscopress.com/articles/article.asp?p=1315434&seqNum=3 https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/ipswitch_cef/configuration/15-mt/isw-cef-15-mt-book/isw-cef-load-balancing.html https://www.cisco.com/c/en/us/td/docs/solutions/Enterprise/Campus/HA_campus_DG/hacampusdg.html
A and C
A and C
i will go with A and C
after researches, i think C & D are more suitable
I will go for AC
BC. Implement security at the core in a capmus layer 3 infrastructure from Cisco official training.
"Access layer The access layer is where user-controlled devices, user-accessible devices, and other end-point devices are connected to the network. The access layer provides both wired and wireless connectivity and contains features and services that ensure security and resiliency for the entire network." https://www.cisco.com/c/en/us/td/docs/solutions/CVD/Campus/cisco-campus-lan-wlan-design-guide.html
D is a catch since fine tuning ECMP hash is not required, you just need to have it in place. https://www.cisco.com/c/dam/global/shared/assets/pdf/cisco_enterprise_campus_infrastructure_design_guide.pdf Nowhere in the guide you can find "fine tune" part.
"As a best practice for ECMP-based Layer 3 networks, Cisco recommends fine-tuning Cisco Express Forwarding load balancing to include Layer 3 and Layer 4 tuple inclusion to compute and derive the first phase of the optimal forwarding decision process between two upstream Layer 3 MEC interfaces." this is under the General Routing Recommendations and Equal Cost Multipath Routing Best practices.
CD https://www.ciscopress.com/articles/article.asp?p=1315434&seqNum=3 A. C is implemented in the routing protocol design, but configuring the passive interface for A requires manual operation on the port, so it is not the best method.
Based on these A,C, and D are all true: https://www.ciscopress.com/articles/article.asp?p=1315434&seqNum=3 https://www.cisco.com/c/dam/global/shared/assets/pdf/cisco_enterprise_campus_infrastructure_design_guide.pdf