Objective 300.030% of exam

Infrastructure

350-401 Practice Questions

Infrastructure is 30% of ENCOR 350-401 and covers Layer 2 and Layer 3 forwarding on Cisco IOS-XE platforms. Expect scenario items on VLANs and trunking, STP variants, EtherChannel, OSPF, EIGRP, BGP, first-hop redundancy, NAT, and NTP, plus configuration-syntax and show-command interpretation rather than pure recall.

Full Practice Test →All Objectives

What this objective tests

350-401 Infrastructure — Key Topics

Configure and verify VLANs, 802.1Q trunks, EtherChannel, OSPF/EIGRP/BGP, HSRP, NAT, and NTP on IOS-XE, interpreting show commands like show ip ospf neighbor. The critical skill is correct Layer 2/Layer 3 forwarding and routing adjacency formation.

Configuring 802.1Q trunk and access ports, native VLAN, and VTP modes on IOS switches
Comparing RSTP, MST, and PVST+ port roles, states, and root bridge election
Tuning OSPF neighbor adjacencies, network types, cost, and passive interfaces
Implementing HSRP, VRRP, or GLBP and verifying with show standby brief

Common exam traps

Where candidates lose marks on Infrastructure

⚠Mixing up HSRP active/standby versus VRRP master/backup terminology, and forgetting HSRP's default priority of 100
⚠Assuming DTP negotiates trunks on all platforms; some Catalyst switches default to dynamic auto or access
⚠Configuring OSPF passive interfaces on links that must form adjacencies, silently blocking hello packets

350-401 Infrastructure — Practice Questions

30 questions from this objective · 30% of your 350-401 exam

Question 2hardmultiple choice

Open the full BGP breakdown →

An engineer is troubleshooting a BGP routing issue. The router is not receiving routes from an eBGP neighbor. The neighbor is reachable via ping. The BGP session is established and in the Established state. What is the most likely cause?

Question 3easymultiple choice

Review the full routing breakdown →

A network administrator needs to allow SSH access to a router from the management network 192.168.1.0/24. Which configuration should be applied?

Question 4mediummulti select

Open the full VLAN trunking answer →

Which TWO actions are valid for configuring 802.1Q trunking on a Cisco switch? (Choose two.)

Question 5hardmulti select

Review the full OSPF breakdown →

Which THREE conditions are required for OSPF routers to become fully adjacent? (Choose three.)

Question 6easymulti select

Review the full routing breakdown →

Which TWO methods can be used to prevent unauthorized access to the privileged EXEC mode on a Cisco router? (Choose two.)

Question 7mediummultiple choice

Review the full OSPF breakdown →

R1 has an OSPF priority of 0. What is its role on the OSPF network?

Exhibit

Refer to the exhibit.

R1# show ip ospf interface GigabitEthernet0/0
GigabitEthernet0/0 is up, line protocol is up
  Internet Address 10.1.1.1/24, Area 0
  Process ID 1, Router ID 1.1.1.1, Network Type BROADCAST, Cost: 1
  Transmit Delay is 1 sec, State BDR, Priority 1
  Designated Router (ID) 2.2.2.2, Interface address 10.1.1.2
  Backup Designated router (ID) 1.1.1.1, Interface address 10.1.1.1
  Timer intervals configured, Hello 10, Dead 40, Wait 40, Retransmit 5

Question 8hardmultiple choice

Infrastructure

350-401 Infrastructure — Key Topics

Where candidates lose marks on Infrastructure

350-401 Infrastructure — Practice Questions

An engineer is troubleshooting a BGP routing issue. The router is not receiving routes from an eBGP neighbor. The neighbor is reachable via ping. The BGP session is established and in the Established state. What is the most likely cause?

A network administrator needs to allow SSH access to a router from the management network 192.168.1.0/24. Which configuration should be applied?

Which TWO actions are valid for configuring 802.1Q trunking on a Cisco switch? (Choose two.)

Which THREE conditions are required for OSPF routers to become fully adjacent? (Choose three.)

Which TWO methods can be used to prevent unauthorized access to the privileged EXEC mode on a Cisco router? (Choose two.)

R1 has an OSPF priority of 0. What is its role on the OSPF network?

Exhibit

Based on the exhibit, which traffic will be permitted outbound on GigabitEthernet0/0?

Exhibit

Which TWO characteristics are true about the operation of Rapid PVST+? (Choose two.)

Drag and drop the steps to configure VLAN Trunking Protocol (VTP) on a Cisco switch in the correct order.

Drag and drop the steps for the EIGRP neighbor discovery process in the correct order.

Match each Cisco IOS command to its function.

Match each EIGRP term to its definition.

A network administrator is configuring a Cisco IOS switch and needs to ensure that the management VLAN interface is reachable from a remote subnet. The switch currently has no IP address configured on any interface. Which command must be applied to assign an IP address to the management VLAN?

A network engineer is configuring a pair of Cisco Catalyst 9300 switches in a StackWise stack. The engineer wants to ensure that a single switch failure does not cause the entire stack to lose its control plane. Which StackWise cabling topology should be used?

A network engineer is implementing OSPFv3 in an IPv6 network. The engineer wants to enable OSPFv3 on an interface and ensure that the interface participates in OSPF area 0. Which command is required to enable OSPFv3 on an interface in Cisco IOS?

A network engineer is implementing VXLAN with BGP EVPN on Cisco Nexus switches. The engineer needs to configure the underlay network to support VXLAN traffic. Which routing protocol is recommended for the underlay in a VXLAN EVPN fabric?

A network administrator needs to configure a Cisco IOS switch port to only allow a single MAC address and to shut down if a different MAC address is seen. Which command should be used?

A network administrator is configuring a Cisco IOS router to authenticate OSPF neighbors using MD5. The administrator wants to ensure that the key is not sent in plaintext and that the key can be changed without disrupting existing adjacencies. Which configuration meets these requirements?

A network engineer is configuring a switch to authenticate users via 802.1X. The authentication server is a Cisco ISC. The engineer wants to ensure that if the authentication server becomes unreachable, authenticated users remain connected. Which feature should be configured?

A network engineer is configuring a switch stack using Cisco StackWise technology. The engineer wants to ensure that the stack operates correctly and provides redundancy. Which two statements are true regarding StackWise operation? (Choose two.)

A network engineer is configuring OSPF on a multi-access network segment. The engineer wants to reduce the number of adjacencies and ensure that only one router floods LSAs to other routers on the segment. Which two OSPF router roles are involved in this design? (Choose two.)

All 350-401 Objectives

Infrastructure

350-401 Infrastructure — Key Topics

Where candidates lose marks on Infrastructure

350-401 Infrastructure — Practice Questions

An engineer is troubleshooting a BGP routing issue. The router is not receiving routes from an eBGP neighbor. The neighbor is reachable via ping. The BGP session is established and in the Established state. What is the most likely cause?

A network administrator needs to allow SSH access to a router from the management network 192.168.1.0/24. Which configuration should be applied?

Which TWO actions are valid for configuring 802.1Q trunking on a Cisco switch? (Choose two.)

Which THREE conditions are required for OSPF routers to become fully adjacent? (Choose three.)

Which TWO methods can be used to prevent unauthorized access to the privileged EXEC mode on a Cisco router? (Choose two.)

R1 has an OSPF priority of 0. What is its role on the OSPF network?

Exhibit

Based on the exhibit, which traffic will be permitted outbound on GigabitEthernet0/0?

Exhibit

Which TWO characteristics are true about the operation of Rapid PVST+? (Choose two.)

Drag and drop the steps to configure VLAN Trunking Protocol (VTP) on a Cisco switch in the correct order.

Drag and drop the steps for the EIGRP neighbor discovery process in the correct order.

Match each Cisco IOS command to its function.

Match each EIGRP term to its definition.

A network administrator is configuring a Cisco IOS switch and needs to ensure that the management VLAN interface is reachable from a remote subnet. The switch currently has no IP address configured on any interface. Which command must be applied to assign an IP address to the management VLAN?

A network engineer is configuring a pair of Cisco Catalyst 9300 switches in a StackWise stack. The engineer wants to ensure that a single switch failure does not cause the entire stack to lose its control plane. Which StackWise cabling topology should be used?

A network engineer is implementing OSPFv3 in an IPv6 network. The engineer wants to enable OSPFv3 on an interface and ensure that the interface participates in OSPF area 0. Which command is required to enable OSPFv3 on an interface in Cisco IOS?

A network engineer is implementing VXLAN with BGP EVPN on Cisco Nexus switches. The engineer needs to configure the underlay network to support VXLAN traffic. Which routing protocol is recommended for the underlay in a VXLAN EVPN fabric?

A network administrator needs to configure a Cisco IOS switch port to only allow a single MAC address and to shut down if a different MAC address is seen. Which command should be used?

A network administrator is configuring a Cisco IOS router to authenticate OSPF neighbors using MD5. The administrator wants to ensure that the key is not sent in plaintext and that the key can be changed without disrupting existing adjacencies. Which configuration meets these requirements?

A network engineer is configuring a switch to authenticate users via 802.1X. The authentication server is a Cisco ISC. The engineer wants to ensure that if the authentication server becomes unreachable, authenticated users remain connected. Which feature should be configured?

A network engineer is configuring a switch stack using Cisco StackWise technology. The engineer wants to ensure that the stack operates correctly and provides redundancy. Which two statements are true regarding StackWise operation? (Choose two.)

A network engineer is configuring OSPF on a multi-access network segment. The engineer wants to reduce the number of adjacencies and ensure that only one router floods LSAs to other routers on the segment. Which two OSPF router roles are involved in this design? (Choose two.)

All 350-401 Objectives