BadAnswer2021/05/18

Question 1

Which options are true about TACACS+?
Uses port 49	
Doesn’t encrypt the entire packet	
Encrypts the entire packet
Uses TCP
Uses ports 1645 and 1812	
Uses UDP

Answer 1

Uses port 49
Encrypts the entire packet
Uses TCP

When contrasting Remote Authentication Dial-In User Service (RADIUS) with Terminal Access Controller Access-Control System Plus (TACACS+), there are a number of differences. RADIUS uses UDP ports 1645 and 1812, doesn’t encrypt the entire packet, and doesn’t support the function to authorize each user to a subset of CLI commands. TACACS+ uses TCP port 49, encrypts the entire packet, supports the function to authorize each user to a subset of CLI commands, and was developed by Cisco (but is widely supported).

Question 2

Which command would enable a switch VLAN interface to act as a DHCP client ?
dhcp enable

ip address dhcp

ip helper-address

ip dhcp client

Answer 2

ip address dhcp

To enable a switch VLAN interface to act as a DHCP client you would need to leverage the ip address dhcp command in interface configuration mode.
The ip helper-address command is used by routers and layer 3 switches to enable DHCP relay messages to be sent outside the current subnet to another “remote” location; it has nothing to do with enabling an interface for DHCP client.
The options ip dhcp client and dhcp enable are not actual commands on a switch.

Question 3

Que montre CDP ? Que montre LLDP ? au niiveau du role des equipements voisins

Answer 3

CDP montre tous les roles possibles,

LLDP juste les roles actifs

Question 4

What is the name of the IPv6 packet field that is used for marking DSCP values?

Traffic Class

Class of Service

Type of Service

IPv6 Priority

Answer 4

Traffic Class

Question 5

Which QoS options are recommended by Cisco when designing for a voice network?

One-way delay < 150 ms	
Round-trip delay < 150 ms	
Jitter < 100 ms	
Jitter < 30 ms
Loss < 2%
Loss < 5%

Answer 5

Jitter < 30 ms

One-way delay < 150 ms

loss is kept under 1%.

Question 6

Quels sont els trois couches réseaux des équipements réseaux ?

Answer 6

Data : Tous ce qui touche au transmission de message
Control : Routage
Management : traffic that is used in the configuration or monitoring of the device itself

Question 7

Quels protocols est propriétaires CISCO ? Pagp ou Lacp ? Quels sont leur mot clef de fonctionnement ?

Answer 7

Pagp propiétaire cisco : auto / desirable

LACP : active / passive

Question 8

Dans quel cas les requetes DNS sont en TCP ?

Answer 8

TCP si la requete dépasse 512bytes