Section 6: Ethernet Fundamentals

Question 1

Link Aggregation Control Protocol

Answer 1

LACP - 802.3ad
▪ Allows for combination of multiple physical connections into a single logical connection to increase available bandwidth and minimize congestion.

Question 2

Power Over Ethernet (PoE)

Answer 2

802.3af
▪ Requires CAT 5 or higher copper cable
▪ Provides up to 15.4 watts of power to device

Question 3

Power Over Ethernet Plus (PoE+)

Answer 3

802.3at
▪ Provides up to 25.5 watts of power to device

Question 4

Port Monitoring or Mirroring

Answer 4

▪ Port mirroring makes a copy of all traffic destined for a port and sends it to another port

Question 5

User Authentication

Answer 5

802.1x
▪ Switches can require users to authenticate themselves before gaining access to the network
▪ Once authenticated, a key is generated and shared between the supplicant (device wanting access) and the switch (authenticator)
▪ Authentication server checks the supplicant’s credentials and creates the key
▪ Key is used to encrypt the traffic coming from and being sent to the client

Question 6

Switch Management Access and Authentication

Answer 6

SSH - Remote Management
Console Port - Local administration/management of the switch. (DB-9 to RJ-45)

Question 7

Out of Band Management

Answer 7

OOB Management - A network separate from the data network for managing network devices.

Question 8

First-Hop Redundancy

Answer 8

Layer 3 Switches (Multilayer Switches) and Routers - Uses Hot-Standby Router Protocol (HSRP) to create virtual IP and MAC addresses to provide active standby routers.

Question 9

GLBP

Answer 9

Gateway Load Balancing Protocol - For Exam just need to know they are another First-Hop Redundancy Protocol but HSRP is most popular/common used in most networks.

Question 10

VRRP

Answer 10

Virtual Router Redundancy Protocol - For Exam just need to know they are another First-Hop Redundancy Protocol but HSRP is most popular/common used in most networks.

Question 11

CARP

Answer 11

Common Address Redundancy Protocol - For Exam just need to know they are another First-Hop Redundancy Protocol but HSRP is most popular/common used in most networks.

Question 12

MAC Filtering

Answer 12

Layer 2 - Permits or denies traffic base on MAC Address

Question 13

Traffic Filtering

Answer 13

Permits or denies traffic at logical layer using IP addresses (Layer 3) or ports (Layer 4)

Question 14

QoS

Answer 14

Quality of Service - Forwards traffic based on quality markers.

Question 15

HSRP

Answer 15

Hot-Standby Router Protocol - uses virtual IP and MAC addresses to provide an “active router” and a “standby router”