Extra Questions

Question 1

What is VTP?

Answer 1

The VLAN Trunk Protocol (VTP) is used to share VLAn information to all switches in a network. The VLAN can be configured on a VTP server for centralized config and management.

Question 2

What can cause signal degradation?

Answer 2

Overcrowded channels, Interference, hardware damage or environmental factors.
NOTE: signal degradation is not equal to signal strength, its about the quality and integrity of the signal.

Question 3

Why should an IDS/IPS alway be on the inside and the firewall on the outside?

Answer 3

The firewall can easily filter out the majority of bad traffic an IDS/IPS could be overwhelmed.

Question 4

Explain the DNS server types: Recursive DNS server, Authoritative DNS server, Primary DNS server, Secondary DNS server

Answer 4

Recursive DNS server: Is the first server that usually gets user requests, its a server like the google DNS. If it doesnt know an IP it goes up to the authoritative, TLD or root server)
Authoritative DNS server: Holds definitive DNS records so the recursive server can request them in case it doesnt know an IP
Primary DNS server: The main authoritative server where the records are created.
Secondary DNS server: A backup of the primary server.

Question 5

What is LACP? What is the IEEE standard?

Answer 5

The Link Aggregation Control Protocol (LACP) provides a method to control the bonding of several physical ports to form a single logical channel. The LACP is defined in the 802.3ad standard.

Question 6

What is LLDP?

Answer 6

The Link Layer Discovery Protocol (LLDP) is a vendor-neutral link layer protocol used by network devices for advertising their identity, capabilities, and neighbors like NDP.

Question 7

What is the difference between SSID & ESSID?

Answer 7

SSID is the name of a network with a single access point and ESSID is the ESSID is the name that describes all access points that are combined to a single network using the ESS configuration.

Question 8

What is the small difference between Tailgaiting and Piggybacking?

Answer 8

With tailgaiting the authorized person is not aware of the unauthorized person following him.

With piggybacking the authorized person is aware of the unauthorized person.

Question 9

What is the WiFi standard that incorporates mechanisms for dynamic frequency selection and transmit power control to make it suitable for environments where radar interference and interference with medical equipment is a concern?
What frequency band does it use?

Answer 9

802.11h and it uses 5GHz Band

Question 10

What is an access control vestibule or mantrap?

Answer 10

Its a device that allows only a single person to enter when authenticated preventing tailgaiting and piggybacking.

Question 11

What is the key difference between server and switch racks?

Answer 11

Switches and routers require better airflow management, while server racks are made for more dense configurations.

Question 12

What is a stub zone in DNS?

Answer 12

Stub zones contain only the necessary information to identify the authoritative DNS servers of a zone

Question 13

What are the 3 technologies used by a captive portal to perform user redirection?

Answer 13

HTTP Redirect
ICMP Redirect
DNS Redirect

Question 14

What is FCoE?

Answer 14

Fiber Channel over Ethernet.

Question 15

What is DR and BCP?

Answer 15

DR (Disaster Recovery) & BCP (Business Continuity Planning)

Question 16

What is the command to purge the cached netbios name table used to resolve host names in a Windows-based network=

Answer 16

nbtstat -R

Question 17

What does Zero-trust require? (3 things)

Answer 17

All the time users, in- and outside need to be:
1. Authenticated
2. Authorized
3. Continuosly validated

Question 18

What is acceptable use policy (AUP)?

Answer 18

AUP sets guidelines as to how a system, network or website should be used

Question 19

How to hide your internal IP when connecting to a WAN/internet?

Answer 19

By using NAT.

Question 20

What is an OTDR/TDR?

Answer 20

An optical time domain reflectometer is used to find breaks in fiber cables, it allows to measure where the break is by sending a light pulse and measuring the time it needs.

A TDR is the same for copper cables.

Question 21

What is the metric used by OSPF/ISIS and what is the metric used by RIP?

Answer 21

OSPF/ISIS use Cost.

RIP uses Hop Count

Question 22

What is AP Isolation?

Answer 22

Access Point Isolation prevents mobile devices in a wireless network to communicate with each other.

Question 23

What is Beamforming?

Answer 23

Beamforming focuses wireless signals in specific directions to improve signal strength

Question 24

What to do if you want to block a specific URL but not the whole domain?

Answer 24

Instead of using an ACL entry, use the browsers group policy blocklist