Cisco CCIE Enterprise Infrastructure lab exam Exam Practice Test
The CCIE Enterprise Infrastructure lab exam practice page addresses enterprise network implementation and troubleshooting across routed and switched environments. The available questions sample IPv4 and IPv6 forwarding, Layer 2 link aggregation, OSPF operation, access-control behavior, DHCP relay, and BGP route advertisement. These topics connect control-plane decisions with the packet-level behavior engineers diagnose in campus and branch networks.
Exam overview
About the Cisco CCIE Enterprise Infrastructure lab exam Exam
Enterprise infrastructure work requires tracing how configuration choices affect reachability and resilience across multiple devices. The question bank includes IPv6 next-hop resolution, OSPF default-route injection and adjacency reduction, and BGP attribute handling when routes pass between eBGP peers. It also touches Layer 2 bundle negotiation, standard ACL matching, stateful return traffic, and DHCP forwarding across routed boundaries. Working through these scenarios can help sharpen the habit of identifying which protocol or device function is responsible for a specific outcome, then distinguishing a missing route, neighbor detail, policy rule, or service relay from a link failure. That diagnostic approach is useful when validating enterprise connectivity and isolating control-plane or forwarding problems.
Sample Practice Questions
Review a selection from this exam's published US Practice Tests practice bank.
A branch router has an IPv6 global unicast address and a default route, but it cannot reach remote IPv6 destinations. The local link is operational. Which additional control-plane information is needed for normal IPv6 next-hop resolution on an Ethernet link?
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Correct answer: BIPv6 Neighbor Discovery, using ICMPv6, resolves link-layer addresses for on-link neighbors and supports router discovery. IPv6 does not use IPv4 ARP; a host or router must be able to resolve the Ethernet address of its IPv6 next hop.
Two switches have redundant Layer 2 links and are configured for a link aggregation group. Which condition is generally required for the links to form one logical bundle?
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Correct answer: ALink aggregation protocols such as LACP require member links to have compatible characteristics and configuration, including speed, duplex, and relevant Layer 2 parameters. Inconsistent settings can prevent links from joining the bundle or cause forwarding problems.
A network uses OSPF and needs to advertise a default route into an area from a router that already has a default route in its routing table. Which OSPF approach is commonly used?
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Correct answer: AThe OSPF default-information originate command is commonly used to advertise a default route into OSPF. By default, the router generally needs a default route in its routing table; an option can be used to originate the default regardless of whether one is present.
An engineer wants an IPv4 ACL to permit only TCP connections initiated from a specified inside subnet toward an external server, while allowing return traffic. Which approach best provides stateful return-traffic handling?
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Correct answer: BA stateful firewall tracks connection state, allowing return packets belonging to an established permitted session without broadly permitting unsolicited inbound traffic. A simple stateless port ACL does not by itself establish that packets are valid replies.
A router learns an IPv6 prefix through OSPFv3. Which IPv6 address type is normally used as the next-hop address for OSPFv3 routes on a link?
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Correct answer: AOSPFv3 uses IPv6 link-local addresses for next-hop information on a link. The router ID remains a 32-bit identifier for OSPF processes, but it is not itself an IPv6 forwarding next hop.
An engineer needs a resilient Layer 2 connection between two switches and wants the switches to negotiate link aggregation dynamically. Which protocol should be used?
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Correct answer: ALACP, standardized as IEEE 802.1AX, negotiates and maintains link aggregation between compatible devices. VRRP and HSRP provide first-hop redundancy, while LLDP advertises device information.
A network uses OSPF and an engineer needs to reduce routing-protocol traffic on a multiaccess segment with many routers. Which OSPF role helps reduce the number of adjacencies formed on that segment?
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Correct answer: AOn broadcast and nonbroadcast multiaccess networks, OSPF elects a designated router and backup designated router. Routers form full adjacencies with these roles rather than forming a full mesh of adjacencies with every router on the segment.
How to use this practice test
Access the practice questions for free. A session presents up to 20 randomly selected questions from the available bank, and results appear after the session. Use missed or uncertain answers to identify protocol behaviors to revisit, such as OSPF route injection, IPv6 next-hop resolution, or BGP propagation.
Preparation tips
- For IPv6 routing scenarios, distinguish a global unicast destination from the link-local next hop used to resolve an OSPFv3 route on a link.
- Compare OSPF default-route origination with the conditions needed to advertise a default, and connect the DR/BDR role on multiaccess networks to adjacency reduction.
- Review LACP negotiation and the configuration compatibility required for two switch links to operate as one logical bundle.
- Trace ACL decisions by matching standard ACL fields to the traffic requirement; separately identify when stateful inspection is needed to permit return traffic.
- Map DHCP relay and BGP route propagation step by step, including how a router forwards client requests across subnets and changes AS_PATH for an eBGP advertisement.