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Cisco 400-201 - CCIE Service Provider Written Exam

Exam Code: 400-201
Exam Name: CCIE Service Provider Written Exam
Updated: Jun 03, 2026
Q & A: 700 Questions and Answers

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Cisco 400-201 Exam Topics:

Section	Weight	Objectives
Core Routing	25%	1. Interior Gateway Protocol a) Describe, implement, and troubleshoot IS-IS b) Describe, implement, and troubleshoot OSPFv2 and OSPFv3 c) Describe and optimize IGP scale and performance 2. Border Gateway Protocol a) Describe, implement, and troubleshoot IBGP, EBGP, and MP-BGP b) Describe, implement, and troubleshoot BGP route policy enforcement c) Describe BGP path attribute d) Describe and optimize BGP scale and performance e) Describe, implement, and troubleshoot advanced BGP features 3. Multiprotocol Label Switching a) Describe MPLS forwarding and control plane mechanisms b) Describe, implement, and troubleshoot LDP c) Describe and optimize LDP scale and performance 4. MPLS Traffic Engineering a) Describe, implement, and troubleshoot RSVP b) Describe, implement, and troubleshoot ISIS and OSPF extensions c) Describe, implement, and troubleshoot MPLS TE policy enforcement d) Describe MPLS TE attributes e) Describe and optimize MPLS TE scale and performance f) Describe, implement, and troubleshoot MPLS advanced features, for example: Segment Routing and MPLS-TE Inter-AS 5. Multicast a) Describe, implement, and troubleshoot PIM (PIM-SM, PIM-SSM, and PIM-BIDIR) b) Describe, implement, and troubleshoot RP (Auto-RP, BSR, Static, Anycast RP, and MSDP) c) Describe, implement, and troubleshoot mVPN d) Describe and optimize multicast scale and performance 6. Quality of Service a) Describe, implement, and troubleshoot classification and marking b) Describe, implement, and troubleshoot congestion management and scheduling c) Describe, implement, and troubleshoot congestion avoidance d) Describe, implement, and troubleshoot MPLS QoS models (Pipe, Short Pipe, and Uniform) e) Describe, implement, and troubleshoot MPLS TE QoS (MAM, RDM, CBTS, PBTS, and DS-TE)
Service Provider Architecture and Services	21%	1. Service provider architecture concepts a) Describe network architecture component and service provider network domains, for example: PE, P, CE, Metro Ethernet Core, Aggregation, RAN Backhaul, and eNodeB b) Describe Cisco IOS, Cisco IOS-XE, and Cisco IOS-XR software architecture components, for example: XR Kernel, System Manager, and Interprocess communication 2. Virtualization concepts a) Describe physical router virtualization, for example: SDR, Multiple-Logical-Routers, and Satellite Network Virtualization b) Describe Network Function Virtualization architecture concepts, for example: Service Function Chaining, ESP, EPN, and NFVI 3. Carrier Ethernet a) Describe, implement, and troubleshoot E-LINE, for example: VPWS b) Describe, implement, and troubleshoot E-LAN and E-TREE, for example: VPLS and H-VPLS c) Describe, implement, and troubleshoot EVPN d) Describe IEEE 802.1ad (Q-in-Q), IEEE 802.1ah (Mac-in-Mac), and ITU G.8032 (REP) 4. L3VPN a) Describe, implement, and troubleshoot L3VPN b) Describe, implement, and troubleshoot Inter-AS L3VPN c) Describe, implement, and troubleshoot multicast VPN d) Describe, implement, and troubleshoot unified MPLS and CSC e) Describe, implement, and troubleshoot shared services, for example: Extranet and Internet access 5. Overlay VPN a) Describe, implement, and troubleshoot L2TPv3 b) Describe LISP 6. Internet service a) Describe, implement, and troubleshoot IPv6 transition mechanism, for example: NAT44, NAT64, 6RD, MAP, and DS Lite b) Describe, implement, and troubleshoot Internet peering route and transit policy enforcement
Access and Aggregation	18%	1. Transport and encapsulation technologies a) Describe transport technologies, for example: optical, xDSL, DOCSIS, TDM, and GPON b) Describe Ethernet technologies c) Describe, implement, and troubleshoot link aggregation techniques 2. PE-CE connectivity a) Describe, implement, and troubleshoot PE-CE routing protocols, for example: static, OSPF, RIP, RIPng, EIGRP, ISIS, and BGP b) Describe, implement, and troubleshoot route redistribution c) Describe, implement, and troubleshoot route filtering d) Describe, implement, and troubleshoot loop prevention techniques in multihomed environments e) Describe, implement, and troubleshoot Multi-VRF CE 3. Quality of Service a) Describe, implement, and troubleshoot classification and marking b) Describe, implement, and troubleshoot congestion management and scheduling, for example: policing, shaping, and queuing c) Describe, implement, and troubleshoot congestion avoidance 4. Multicast a) Describe, implement, and troubleshoot IGMP and MLD b) Describe, implement, and troubleshoot PIM c) Describe, implement, and troubleshoot RP d) Describe and optimize multicast scale and performance
High Availability and Fast Convergence	14%	1. System level HA a) Describe Multichassis/clustering HA b) Describe, implement, and troubleshoot SS0/NSF, NSR, and GR c) Describe, implement, and troubleshoot IGP-LDP Sync d) Describe, implement, and troubleshoot LDP Session Protection 2. Layer 1/2/3 failure detection techniques a) Describe Layer 1 failure detection b) Describe, implement, and troubleshoot Layer 2 failure detection c) Describe, implement, and troubleshoot Layer 3 failure detection 3. Routing/fast convergence a) Describe, implement, and optimize IGP convergence b) Describe, implement, and optimize BGP convergence c) Describe, implement, and optimize IP FRR and MPLS TE FRR
Service Provider Security, Operation, and Management	12%	1. Control plane security a) Describe, implement, and troubleshoot control plane protection techniques, for example: LPTS and CoPP b) Describe, implement, and troubleshoot routing protocol security, for example: BGP-TTL security and protocol authentication c) Describe, implement, and troubleshoot BGP prefix suppression d) Describe, implement, and troubleshoot LDP security, for example: authentication and label allocation filtering e) Describe, implement, and troubleshoot BGP prefix based filtering f) Describe, implement, and troubleshoot BGPsec 2. Management plane security a) Describe, implement, and troubleshoot device management, for example: MPP, SSH, and VTY b) Describe, implement, and troubleshoot logging and SNMP security c) Describe backscatter Traceback 3. Infrastructure security a.)Describe, implement, and troubleshoot uRPF b) Describe Lawful-intercept c) Describe, implement, and troubleshoot iACL d) Describe, implement, and troubleshoot RTBH e) Describe, implement, and troubleshoot BGP Flowspec f) Describe DDoS mitigation techniques 4. Timing and synchronization a) Describe timing protocol, for example: NTP, 1588v2, and SyncE 5. Network monitoring and troubleshooting a) Describe, implement, and troubleshoot syslog and logging functions b) Describe, implement, and troubleshoot SNMP traps, RMON, EEM, and EPC c) Describe, implement, and troubleshoot NetFlow and IPFIX d) Describe, implement, and troubleshoot IP SLA e0 Describe, implement, and troubleshoot MPLS OAM and Ethernet OAM 6. Network configuration and change management a0 Describe configuration change, implementation, and rollback
Evolving Technologies v1.1	10%	1 Cloud a) Compare and contrast Cloud deployment models a) [i] Infrastructure, platform, and software services (XaaS) a) [ii] Performance and reliability a) [iii] Security and privacy a) [iv] Scalability and interoperability b) Describe Cloud implementations and operations b) [i] Automation and orchestration b) [ii] Workload mobility b) [iii] Troubleshooting and management b) [iv] OpenStack components 2 Network Programmability (SDN) a) Describe functional elements of network programmability (SDN) and how they interact a) [i] Controllers a) [ii] APIs a) [iii] Scripting a) [iv] Agents a) [v] Northbound vs. Southbound protocols b) Describe aspects of virtualization and automation in network environments b) [i] DevOps methodologies, tools and workflows b) [ii] Network/application function virtualization (NFV, AFV) b) [iii] Service function chaining b) [iv] Performance, availability, and scaling considerations 3 Internet of Things (IoT) a) Describe architectural framework and deployment considerations for Internet of Things a) [i] Performance, reliability and scalability a) [ii] Mobility a) [iii] Security and privacy a) [iv] Standards and compliance a) [v] Migration a) [vi] Environmental impacts on the network

Section

Weight

Objectives

Core Routing

25%

1. Interior Gateway Protocol
a) Describe, implement, and troubleshoot IS-IS
b) Describe, implement, and troubleshoot OSPFv2 and OSPFv3
c) Describe and optimize IGP scale and performance

2. Border Gateway Protocol
a) Describe, implement, and troubleshoot IBGP, EBGP, and MP-BGP
b) Describe, implement, and troubleshoot BGP route policy enforcement
c) Describe BGP path attribute
d) Describe and optimize BGP scale and performance
e) Describe, implement, and troubleshoot advanced BGP features

3. Multiprotocol Label Switching
a) Describe MPLS forwarding and control plane mechanisms
b) Describe, implement, and troubleshoot LDP
c) Describe and optimize LDP scale and performance

4. MPLS Traffic Engineering
a) Describe, implement, and troubleshoot RSVP
b) Describe, implement, and troubleshoot ISIS and OSPF extensions
c) Describe, implement, and troubleshoot MPLS TE policy enforcement
d) Describe MPLS TE attributes
e) Describe and optimize MPLS TE scale and performance
f) Describe, implement, and troubleshoot MPLS advanced features, for example: Segment Routing and MPLS-TE Inter-AS

5. Multicast
a) Describe, implement, and troubleshoot PIM (PIM-SM, PIM-SSM, and PIM-BIDIR)
b) Describe, implement, and troubleshoot RP (Auto-RP, BSR, Static, Anycast RP, and MSDP)
c) Describe, implement, and troubleshoot mVPN
d) Describe and optimize multicast scale and performance

6. Quality of Service
a) Describe, implement, and troubleshoot classification and marking
b) Describe, implement, and troubleshoot congestion management and scheduling
c) Describe, implement, and troubleshoot congestion avoidance
d) Describe, implement, and troubleshoot MPLS QoS models (Pipe, Short Pipe, and Uniform)
e) Describe, implement, and troubleshoot MPLS TE QoS (MAM, RDM, CBTS, PBTS, and DS-TE)

Service Provider Architecture and Services

21%

1. Service provider architecture concepts
a) Describe network architecture component and service provider network domains, for example: PE, P, CE, Metro Ethernet Core, Aggregation, RAN Backhaul, and eNodeB
b) Describe Cisco IOS, Cisco IOS-XE, and Cisco IOS-XR software architecture components, for example: XR Kernel, System Manager, and Interprocess communication

2. Virtualization concepts
a) Describe physical router virtualization, for example: SDR, Multiple-Logical-Routers, and Satellite Network Virtualization
b) Describe Network Function Virtualization architecture concepts, for example: Service Function Chaining, ESP, EPN, and NFVI

3. Carrier Ethernet
a) Describe, implement, and troubleshoot E-LINE, for example: VPWS
b) Describe, implement, and troubleshoot E-LAN and E-TREE, for example: VPLS and H-VPLS
c) Describe, implement, and troubleshoot EVPN
d) Describe IEEE 802.1ad (Q-in-Q), IEEE 802.1ah (Mac-in-Mac), and ITU G.8032 (REP)

4. L3VPN
a) Describe, implement, and troubleshoot L3VPN
b) Describe, implement, and troubleshoot Inter-AS L3VPN
c) Describe, implement, and troubleshoot multicast VPN
d) Describe, implement, and troubleshoot unified MPLS and CSC
e) Describe, implement, and troubleshoot shared services, for example: Extranet and Internet access

5. Overlay VPN
a) Describe, implement, and troubleshoot L2TPv3
b) Describe LISP

6. Internet service
a) Describe, implement, and troubleshoot IPv6 transition mechanism, for example: NAT44, NAT64, 6RD, MAP, and DS Lite
b) Describe, implement, and troubleshoot Internet peering route and transit policy enforcement

Access and Aggregation

18%

1. Transport and encapsulation technologies
a) Describe transport technologies, for example: optical, xDSL, DOCSIS, TDM, and GPON
b) Describe Ethernet technologies
c) Describe, implement, and troubleshoot link aggregation techniques

2. PE-CE connectivity
a) Describe, implement, and troubleshoot PE-CE routing protocols, for example: static, OSPF, RIP, RIPng, EIGRP, ISIS, and BGP
b) Describe, implement, and troubleshoot route redistribution
c) Describe, implement, and troubleshoot route filtering
d) Describe, implement, and troubleshoot loop prevention techniques in multihomed environments
e) Describe, implement, and troubleshoot Multi-VRF CE

3. Quality of Service
a) Describe, implement, and troubleshoot classification and marking
b) Describe, implement, and troubleshoot congestion management and scheduling, for example: policing, shaping, and queuing
c) Describe, implement, and troubleshoot congestion avoidance

4. Multicast
a) Describe, implement, and troubleshoot IGMP and MLD
b) Describe, implement, and troubleshoot PIM
c) Describe, implement, and troubleshoot RP
d) Describe and optimize multicast scale and performance

High Availability and Fast Convergence

14%

1. System level HA
a) Describe Multichassis/clustering HA
b) Describe, implement, and troubleshoot SS0/NSF, NSR, and GR
c) Describe, implement, and troubleshoot IGP-LDP Sync
d) Describe, implement, and troubleshoot LDP Session Protection

2. Layer 1/2/3 failure detection techniques
a) Describe Layer 1 failure detection
b) Describe, implement, and troubleshoot Layer 2 failure detection
c) Describe, implement, and troubleshoot Layer 3 failure detection

3. Routing/fast convergence
a) Describe, implement, and optimize IGP convergence
b) Describe, implement, and optimize BGP convergence
c) Describe, implement, and optimize IP FRR and MPLS TE FRR

Service Provider Security, Operation, and Management

12%

1. Control plane security
a) Describe, implement, and troubleshoot control plane protection techniques, for example: LPTS and CoPP
b) Describe, implement, and troubleshoot routing protocol security, for example: BGP-TTL security and protocol authentication
c) Describe, implement, and troubleshoot BGP prefix suppression
d) Describe, implement, and troubleshoot LDP security, for example: authentication and label allocation filtering
e) Describe, implement, and troubleshoot BGP prefix based filtering
f) Describe, implement, and troubleshoot BGPsec

2. Management plane security
a) Describe, implement, and troubleshoot device management, for example: MPP, SSH, and VTY
b) Describe, implement, and troubleshoot logging and SNMP security
c) Describe backscatter Traceback

3. Infrastructure security
a.)Describe, implement, and troubleshoot uRPF
b) Describe Lawful-intercept
c) Describe, implement, and troubleshoot iACL
d) Describe, implement, and troubleshoot RTBH
e) Describe, implement, and troubleshoot BGP Flowspec
f) Describe DDoS mitigation techniques

4. Timing and synchronization
a) Describe timing protocol, for example: NTP, 1588v2, and SyncE

5. Network monitoring and troubleshooting
a) Describe, implement, and troubleshoot syslog and logging functions
b) Describe, implement, and troubleshoot SNMP traps, RMON, EEM, and EPC
c) Describe, implement, and troubleshoot NetFlow and IPFIX
d) Describe, implement, and troubleshoot IP SLA
e0 Describe, implement, and troubleshoot MPLS OAM and Ethernet OAM

6. Network configuration and change management
a0 Describe configuration change, implementation, and rollback

Evolving Technologies v1.1

10%

1 Cloud
a) Compare and contrast Cloud deployment models
a) [i] Infrastructure, platform, and software services (XaaS)
a) [ii] Performance and reliability
a) [iii] Security and privacy
a) [iv] Scalability and interoperability
b) Describe Cloud implementations and operations
b) [i] Automation and orchestration
b) [ii] Workload mobility
b) [iii] Troubleshooting and management
b) [iv] OpenStack components

2 Network Programmability (SDN)
a) Describe functional elements of network programmability (SDN) and how they interact
a) [i] Controllers
a) [ii] APIs
a) [iii] Scripting
a) [iv] Agents
a) [v] Northbound vs. Southbound protocols
b) Describe aspects of virtualization and automation in network environments
b) [i] DevOps methodologies, tools and workflows
b) [ii] Network/application function virtualization (NFV, AFV)
b) [iii] Service function chaining
b) [iv] Performance, availability, and scaling considerations

3 Internet of Things (IoT)
a) Describe architectural framework and deployment considerations for Internet of Things
a) [i] Performance, reliability and scalability
a) [ii] Mobility
a) [iii] Security and privacy
a) [iv] Standards and compliance
a) [v] Migration
a) [vi] Environmental impacts on the network

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