Protocols

Question 1

CDP

Answer 1

Cisco Discovery Protocol

L2

Discovers information regarding neighboring routers and switches

Question 2

CHAP

Answer 2

Challenge Handshake Authentication Protocol

L2 Protocol

Used in conjuction with PPP for secure password authentication

Question 3

HDLC

Answer 3

High-Level Data Link Control

L2 Protocol

Used to transmit data between network points or nodes

Is Cisco Proprietary and is the default encapsulation method btw nodes in Cisco devs

Does not allow for authentication, Compression or error correction

Question 4

IEEE 802.11

Answer 4

Used for WiFi

L2

Uses Ethernet and CSMA/CA

Question 5

LLC

Answer 5

Logical Link Control - IEEE 802.2

L2 Protocol

Interface btw MAC and network layer

Does multiplexing to allow different network protocols to coexist over same medium

Provides flow control and error management

Question 6

LACP

Answer 6

Link Aggregation Control Protocol - IEEE 802.3ad

L2

One of the protocols for Etherchannel to aggregate phyiscal links at L2 for load balancing and redundancy in network

Is not Cisco proprietary

Question 7

LLDP

Answer 7

Link Layer Discovery Protocol - IEEE 802.1ab

L2 Protocol

Just like CDP to discover details about neighbors

Is open sourced

Question 8

LCP

Answer 8

Link Control Protocol

L2 Protocol

Works on PPP

This protocol establishes, configures and tests the link when set up btw two nodes

Also negotiates settings, options and use of the features.

Question 9

MAC

Answer 9

Media Access Control

L2 protocol

Layer that controls hardware responsible for interaction with the L1

Provides for Flow Control and multiplexing

Question 10

PAgP

Answer 10

Port Aggregation Protocol

L2

Cisco proprietary same as LACP

Question 11

PPP

Answer 11

Point-to-Point Protocol - IEEE

L2 protocol

Protocol to communicate btw two hosts

Can provide autentication, encryption and compression

Authentication provided via CHAP or PAP

Question 12

STP

Answer 12

Spanning Tree Protocol - 802.1D

L2 Protocol

Meant to turn down redundant loops to prevent frames from looping through the network

Flavors are:

Rapid Spanning Tree - 802.1w

Question 13

VTP

Answer 13

VLAN Trunk Protocol

Propogates VLANs through entire network

Question 14

VLAN

Answer 14

Virtual Local Area Networks - IEEE 802.1q

Trunks established to transit VLANs

Question 15

ARP

Answer 15

Address Resolution Protocol

L2 protocol

Resolution protocol to translate a MAC address to an IP address

Question 16

EIGRP

Answer 16

Enhanced Interior Gateway Routing Protocol

L3 Protocol

Used on routers to share routes with other routers within the same AS

Only sends incremental updates

Is hybrid distance vector protocol

Best for bigger campuses

Question 17

GRE

Answer 17

Generic Routing Encapsulation

L3 protocol

Tunneling protocol that can encapsulate numerou