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| Section | Weight | Objectives |
|---|---|---|
| Architecture | 15% | - Cisco SD-WAN and SD-Access
|
| Virtualization | 10% | - Device virtualization
|
| Infrastructure | 30% | - Network services
|
| Automation and Programmability | 15% | - Network automation fundamentals
|
| Security | 20% | - Network access control
|
| Network Assurance | 10% | - Troubleshooting methodologies - Monitoring and telemetry
|
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問題 #357
If AP power level is increased from 25 mW to 100 mW. what is the power difference in dBm?
答案：B
問題 #358
Refer to the exhibit.
A network engineer issues the debug command while troubleshooting a network issue. What does the output confirm?
答案：C
解題說明：
The debug output indicates that detailed IP packet tracking is enabled for ACL100. The log entries show packets with source IP s=1.1.1.1 (associated with Serial1/0) and destination IP d=10.1.1.1 (associated with Serial3/0). The packets are of the ICMP type, as shown by "ICMP type=0, code=0". This confirms that ACL100 is indeed tracking ICMP traffic from Serial 1/0 to Serial3/0.
問題 #359
What mechanism does PIM use to forward multicast traffic?
答案：D
解題說明：
PIM Sparse Mode operates according to a pull model . Multicast traffic is forwarded only into portions of the network where receivers have explicitly expressed interest. Cisco describes PIM-SM as adding sparse-mode interfaces to multicast forwarding state when downstream PIM Join messages are received or when a directly connected group member exists. This avoids the initial network-wide flooding behavior associated with dense mode and conserves bandwidth in environments where multicast receivers are sparsely distributed. Therefore, option B is correct.
Option A describes the fundamental behavior of PIM Dense Mode, which initially assumes that receivers exist throughout the topology, floods multicast traffic, and subsequently prunes branches without interested receivers. Option C incorrectly assigns RP registration to receivers. A multicast source ' s first-hop router sends PIM Register messages toward the Rendezvous Point; receivers instead cause their local routers to construct multicast state and send Join messages toward the RP. Option D reverses the two models: dense mode is fundamentally flood-and-prune rather than pull-based.
For ENCOR, the architectural distinction is straightforward: PIM-DM = push/flood-and-prune; PIM-SM = pull/explicit joins through an RP-based shared tree initially .
Study Guide Reference: ENCOR v1.2 3.0 Infrastructure # 3.3 IP Services # 3.3.d Multicast protocols including PIM-SM, RPF, IGMP, SSM, bidir, and MSDP .
問題 #360
Drag and drop the LISP components from the left onto the function they perform on the right. Not all options are used.
答案：
解題說明：
+ accepts LISP encapsulated map requests: LISP map resolver
+ learns of EID prefix mapping entries from an ETR: LISP map server
+ receives traffic from LISP sites and sends it to non-LISP sites: LISP proxy ETR
+ receives packets from site-facing interfaces: LISP ITR
Explanation
ITR is the function that maps the destination EID to a destination RLOC and then encapsulates the original packet with an additional header that has the source IP address of the ITR RLOC and the destination IP address of the RLOC of an Egress Tunnel Router (ETR).
After the encapsulation, the original packet become a LISP packet.
ETR is the function that receives LISP encapsulated packets, decapsulates them and forwards to its local EIDs. This function also requires EID-to-RLOC mappings so we need to point out an "map-server" IP address and the key (password) for authentication.
A LISP proxy ETR (PETR) implements ETR functions on behalf of non-LISP sites. A PETR is typically used when a LISP site needs to send traffic to non-LISP sites but the LISP site is connected through a service provider that does not accept no routable EIDs as packet sources. PETRs act just like ETRs but for EIDs that send traffic to destinations at non-LISP sites.
Map Server (MS) processes the registration of authentication keys and EID-to-RLOC mappings. ETRs sends periodic Map-Register messages to all its configured Map Servers.
Map Resolver (MR): a LISP component which accepts LISP Encapsulated Map Requests, typically from an ITR, quickly determines whether or not the destination IP address is part of the EID namespace
問題 #361
What are two of benefits of using VXLAN? (Choose two.)
答案：A,E
問題 #362
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