Cisco Certified Network Professional – Implementing Cisco Enterprise Advanced Routing and Services (CCNP-ENARSI)是CCNP-Enterprise的其中一門選修科目，考試一共有55-65題，考試時間120分鐘，及格分數825分，答對率要超過75%才會通過，抓13題的容錯空間。

考試範圍 ，在準備的時候，請務必先看過這個再分配時間。

• 35% – 1.0 Layer 3 Technologies
  • 1.1 Troubleshoot administrative distance (all routing protocols)
  • 1.2 Troubleshoot route map for any routing protocol (attributes, tagging, filtering)
  • 1.3 Troubleshoot loop prevention mechanisms (filtering, tagging, split horizon, route poisoning)
  • 1.4 Troubleshoot redistribution between any routing protocols or routing sources
  • 1.5 Troubleshoot manual and auto-summarization with any routing protocol
  • 1.6 Configure and verify policy-based routing
  • 1.7 Configure and verify VRF-Lite
  • 1.8 Describe Bidirectional Forwarding Detection
  • 1.9 Troubleshoot EIGRP (classic and named mode)
    • 1.9.a Address families (IPv4, IPv6)
    • 1.9.b Neighbor relationship and authentication
    • 1.9.c Loop-free path selections (RD, FD, FC, successor, feasible successor, stuck in active)
    • 1.9.d Stubs
    • 1.9.e Load balancing (equal and unequal cost)
    • 1.9.f Metrics
  • 1.10 Troubleshoot OSPF (v2/v3)
    • 1.10.a Address families (IPv4, IPv6)
    • 1.10.b Neighbor relationship and authentication
    • 1.10.c Network types, area types, and router types
      • 1.10.c (i) Point-to-point, multipoint, broadcast, nonbroadcast
      • 1.10.c (ii) Area type: backbone, normal, transit, stub, NSSA, totally stub
      • 1.10.c (iii) Internal router, backbone router, ABR, ASBR
      • 1.10.c (iv)Virtual link
      • 1.10.d Path preference
    • 1.11 Troubleshoot BGP (Internal and External)
      • 1.11.a Address families (IPv4, IPv6)
      • 1.11.b Neighbor relationship and authentication (next-hop, mulithop, 4-byte AS, private AS, route refresh, synchronization, operation, peer group, states and timers)
      • 1.11.c Path preference (attributes and best-path)
      • 1.11.d Route reflector (excluding multiple route reflectors, confederations, dynamic peer)
      • 1.11.e Policies (inbound/outbound filtering, path manipulation)
• 20% – 2.0 VPN Technologies
  • 2.1 Describe MPLS operations (LSR, LDP, label switching, LSP)
  • 2.2 Describe MPLS Layer 3 VPN
  • 2.3 Configure and verify DMVPN (single hub)
    • 2.3.a GRE/mGRE
    • 2.3.b NHRP
    • 2.3.c IPsec
    • 2.3.d Dynamic neighbor
    • 2.3.e Spoke-to-spoke
• 20% – 3.0 Infrastructure Security
  • 3.1 Troubleshoot device security using IOS AAA (TACACS+, RADIUS, local database)
  • 3.2 Troubleshoot router security features
  • 3.2.a IPv4 access control lists (standard, extended, time-based)
  • 3.2.b IPv6 traffic filter
  • 3.2.c Unicast reverse path forwarding (uRPF)
  • 3.3 Troubleshoot control plane policing (CoPP) (Telnet, SSH, HTTP(S), SNMP, EIGRP, OSPF, BGP)
  • 3.4 Describe IPv6 First Hop security features (RA guard, DHCP guard, binding table, ND inspection/snooping, source guard)
• 25% – 4.0 Infrastructure Services
  • 4.1 Troubleshoot device management
    • 4.1.a Console and VTY
    • 4.1.b Telnet, HTTP, HTTPS, SSH, SCP
    • 4.1.c (T)FTP
  • 4.2 Troubleshoot SNMP (v2c, v3)
  • 4.3 Troubleshoot network problems using logging (local, syslog, debugs, conditional debugs, timestamps)
  • 4.4 Troubleshoot IPv4 and IPv6 DHCP (DHCP client, IOS DHCP server, DHCP relay, DHCP options)
  • 4.5 Troubleshoot network performance issues using IP SLA (jitter, tracking objects, delay, connectivity)
  • 4.6 Troubleshoot NetFlow (v5, v9, flexible NetFlow)
  • 4.7 Troubleshoot network problems using Cisco DNA Center assurance (connectivity, monitoring, device health, network health)

由於本人先前準備時，只著重在前面的路由協定，因此這部分拿了很高分。
ENARSI的電子書有24章節，前面20章節屬於前兩個大項目(Layer 3 Technologies, VPN Technologies)，後面4章節便是剩下二者(Infrastructure Security, Infrastructure Services)，後4章平均每章佔11.25%的總分，因此建議要先把時間都投入在後四章上面。

因為有上過正規課程，課堂教材上的範圍沒有跟考試範圍一樣，考試是更廣更細更深。會有新玩意進來，就像DNA Center，因此，在八成往考試範圍唸，兩成就往其他地方嘗試，像是用 show 去看看有甚麼指令跟選項，都可以去瞭解。

學習資源取得：

1. Office Cert Guide：「學習資源搜集」。
2. 課堂LAB：因為版權問題，無法提供。
3. GNS3：官方網站。
4. Router ISO：範例都用R7200，請參考「學習資源搜集」。
5. 鴻鵠論壇題庫：找同學要，建議剛出版的兩周內去考，過太久否則就看個人實力。

經驗指南：

1. 先了解這門考試的範圍，一些注意事項，看看前人的經驗談。
2. 制定合理的學習規劃，四大項可以平均分配時間。
3. 正規教材去逐一章節學習，筆記需要背誦記憶的知識。
4. 做LAB不斷學習。
5. 複習需背誦的知識，畫架構。
6. 做題庫練習。
7. 從題庫的題目去做衍生學習，將細節作筆記。
8. 重新複習需背誦的知識。
9. 考前複習題庫。
10. 考試GO！