Free Practice Questions for the Cisco CCNP Enterprise 350-401 Exam (2026 Updated)

The status code shown in the exhibit is HTTP 403, which means the server understood the request but refused to authorize it. This is different from a missing resource, unreachable server, or state conflict. Option D is correct because a 403 Forbidden response indicates that access was denied due to authorization, permission, policy, or authentication-context restrictions. Option A describes a 410 Gone condition, where the resource is no longer available. Option B is not represented by a 403; unreachable resources normally produce network errors, timeouts, DNS issues, or gateway-level errors. Option C aligns more closely with HTTP 409 Conflict, which indicates the request conflicts with the current state of the resource. In API troubleshooting, reading the response code accurately matters. 401 usually means authentication is required or failed, while 403 means the client is recognized or the request is understood, but access is not allowed. The ENCOR automation focus is interpreting REST API status codes correctly during controller, network assurance, and programmability workflows. References/topics: ENCOR Automation, REST APIs, HTTP response codes, API authorization, 403 Forbidden, controller API troubleshooting.

The correct answer is D. It provides isolation among the virtual networks and independence from the physical network.

Cisco SD-Access is based on two main layers:

Underlay network → Physical infrastructure (routers, switches, IP connectivity)

Overlay network → Virtualized logical network built on top of the underlay

According to Cisco ENCOR architecture principles, the overlay network:

Uses technologies like LISP (control plane) and VXLAN (data plane)

Creates virtual networks (VNs) for segmentation

Provides end-to-end logical separation (macro-segmentation)

Is independent of the physical topology

Enables scalable and flexible network design

Thus, the overlay abstracts the complexity of the underlay and ensures isolation between different user groups, departments, or tenants.

Directly describes virtual network segmentation

Matches Cisco’s definition of overlay abstraction and independence

Core principle of SD-Access fabric design

A. Multicast and Layer 2 flooding relate more to underlay or legacy designs, not overlay behavior.

B. Describes the underlay network (physical devices), not overlay.

C. Refers to traditional network design, which SD-Access replaces.

Underlay = Physical IP network (reachability)

Overlay = Virtual segmentation & policy (VXLAN + LISP)

Overlay = Abstraction + Segmentation + Independence

1 and 3 – Configuration

4 and 5 – Orchestration

The correct answer is B. TLS or SSL for communication.

In basic API authentication, credentials (such as username and password) are often transmitted using Base64 encoding, which is not encrypted. This makes them vulnerable to sniffer (packet capture) attacks if sent over an unencrypted channel.

TLS (Transport Layer Security) and its predecessor SSL provide encryption of the communication channel.

This ensures that even if packets are captured, the credentials remain confidential and unreadable.

Cisco documentation emphasizes that APIs (RESTCONF, HTTP-based APIs) should use HTTPS (HTTP over TLS) to secure credentials in transit.

A. VPN connection between client and server While a VPN encrypts traffic, it is not specifically required for API authentication security. The standard and expected method is TLS/HTTPS.

C. AAA services to authenticate the API AAA controls who can access, but it does not encrypt credentials in transit.

D. next-generation firewall A firewall provides traffic filtering and threat protection but does not directly secure credential transmission in basic API authentication.

Basic Authentication = NOT secure by itself

Always pair it with HTTPS (TLS encryption)

Rule to remember:

If credentials travel over the network → encrypt with TLS

Solution:

R22

config t

int tunn0

vrf forwarding FINANCE

ip add 10.11.22.2 255.255.255.0

tunn so e0/0

tunn dest 209.165.200.230

no shut

int et0/1

vrf forward FINANCE

ip add 10.22.22.1 255.255.255.252

no shut

ip route vrf FINANCE 10.10.111.0 255.255.255.0 tunn0

wr

Solution:

R3

Config#int et0/1

config-if#ip ospf priority 255

wr

R20

clear ip ospf process

yes

R10

int et0/0

ip ospf priority 0

wr

R2

clear ip ospf process

yes

Solution:

router bgp 10

bgp router-id 10.1.1.111

no bgp defa ipv4-unicast

nei 209.165.200.226 remote-as 20

nei 209.165.202.130 remote-as 30

address-family ipv4

neigh 209.165.200.226 activate

neigh 209.165.202.130 activate

network 10.1.1.10 mask 255.255.255.255

network 209.165.201.10 mask 255.255.255.255

network 209.165.201.20 mask 255.255.255.255

wr

Solution: -

Sw10

Config t

no int po1

default int ran et0/0-2

int ran e0/0-2

switchport trunk encap dot1q

switchport mode trunk

channel-group 1 mode active

no shut

wr

Solution:

Copy run start

Verification:

OR

Solution:

R1

config t

flow record NetFlow-Record

match ipv4 source address

match ipv4 destination address

collect country bytes

flow exporter NetFlow-Exporter

destination 10.10.1.10

transport udp 9996

flow monitor NetFlow-Monitor

record NetFlow-Record

exporter NetFlow-Exporter

exit

int et0/0

ip flow monitor NetFlow-Monitor input

ip sla 1

http get http://10.10.1.100

frequency 600

exit

ip sla schedule 1 start-time now

wr

Sw1

config t

monitor session 2 source int e0/0

monitor session 2 source int et0/2

monitor session 2 destination interface e1/0

wr

Solution:

R2

config t

username NetworkAdmin privilege 15 password CiscoENCOR

line vty 0 4

login local

transport input telnet rlogin

exec-timepit 20

Solution:

Sw10

config t

no int po2

int et0/0

channel-group 2 mode active

no shut

spanning-tree vlan 10a pri 0

wr

Solution:

R1

Config t

Flow exporter Export-NetFlowENCOR

destination 10.10.1.110

transport udp 2055

exit

flow moni Monitor-NetFlowENCOR

exit

ip sla 1

http gethttp://10.10.1.100

frequ 300

exit

ip sla schedule 1 life forever start-time now

wr

SW1

Config t

Monitor session 7 source interface e0/0

Monitor session 7 destination interface e1/1

End

Wr

Solution:

R10

Copy run start

R20

Copy run start

Verification:

Solution:

R30

show ip access-list

config t

ip access-list extended 120

5 permit eigrp any any

wr

R20

config t

ip access-list extended 100

permit tcp 192.168.25.0 0.0.0.255 any eq 23

class-map match-any TELNET

match access-group 100

policy-map CoPP

class TELNET

police 10000 conform-action transmit exceed-action drop

control-plane

service-policy input CoPP

wr

Solution:

R30

Config t

router ospf 10

router-id 10.0.1.30

int ran lo0 , e0/0-1

ip ospf 10 a 0

exit

int et0/2

ip ospf 10 a 50

exit

router ospf 10

area 50 range 10.10.0.0 255.255.128.0

area 50 range 10.50.0.0 255.255.128.0

end

Solution:

R1

config

flow exporter Export-NetFlowENCOR

transport udp 2055

ip sla schedule 100 life forever start-time now

wr

Sw1

monitor session 11 source interface e0/2

monitor session 11 destination interface et1/1

wr

OR

Solution:

R1

Config t

Int et0/0

Ip flow monitor Monitor-R1Flow input

Ip flow monitor Monitor-R1Flow output

Exit

Ip sla 1

Icmp-echo 10.12.1.2

Freq 300

Ip sla schedule 1 life foreve start-time now

Sw1

Config t

Monitor session 12 source vlan 12

Monitor session 12 destination interface et1/3

Solution:

R30

Config t

router ospf 100

router-id 10.0.1.30

int ran lo0 , e0/0-1

ip ospf 100 a 0

exit

int et0/2

ip ospf 100 a 50

exit

router ospf 30

area 50 range 10.10.0.0 255.255.192.0

area 50 range 10.50.0.0 255.255.192.0

end

wr

Solution:-

Copy run start

Solution:

VERIFICATION: -

OR

Solution:

R3

Int e0/1

Ip ospf priority 255

End

Copy run start

R2

Int e0/1

Ip ospf network point-to-point

End

Copy run start

R10

Int e0/0

Ip ospf network point-to-point

End

Copy run start

Solution:

Copy run start

Verification:

OR

Solution:

Sw10

config t

no int po20

int et0/0

channel-group 20 mode active

no shut

spanning-tree vlan 20 pri 0

wr

Verification:-

Solution:

R30

Config t

router ospf 100

router-id 10.0.1.30

int ran lo0 , e0/0-1

ip ospf 100 a 0

exit

int et0/2

ip ospf 100 a 50

exit

router ospf 30

area 50 range 10.10.0.0 255.255.192.0

area 50 range 10.50.0.0 255.255.192.0

end

wr

Solution:

R1

en

Conf t

Router ospf 10

Router-id 10.x.x.x – lo0 address

Int range lo0, e0/0-1

Ip ospf 10 area 0

Exit

wr

R2

Router ospf 10

Area 10 range 10.1.0.0 255.255.0.0

exit

wr

R3

Router ospf 10

Area 10 range 10.2.0.0 255.255.0.0

Exit

Wr

OR

Solution:

Copy run start

Copy run start

Copy run start

Verification:-

OR

Solution:

Solution on R1:

R1# copy run start

Verification:

OR

Solution:

R2

R3

Solution:

R22

int tun0

vrf forwarding FINANCE

ip add 10.10.10.2 255.255.255.0

tunn source e0/0

tunnel dest 209.165.200.230

no shut

ip route vrf FINANCE 10.10.111.0 255.255.255.0 tunn0

int et0/1

vrf forwarding FINANCE

ip address 10.22.22.1 255.255.255.252

wr

Verification:-

Solution:-

Default int range et0/0-1

Int range e0/0 – 1

Sw trunk encap dot1

Switch mode trunk

Channel-group 2 mode passive

No shut

Spanning-tree vlan 10 priority 0

Spanning-tree vlan 30 priority 0

Solution:

R2

show ip access-list

config t

ip access-list extended 151

5 permit eigrp any any

wr

R3

config t

ip access-list extended 100

permit tcp 192.168.211.0 0.0.0.255 any eq 22

class-map match-any SSH

match access-group 100

policy-map CoPP

class SSH

police 8000 conform-action transmit exceed-action drop

control-plane

service-policy input CoPP