Cisco CCNA Routing and Switching 200-120 Official Cert Guide Library by Wendell Odom

Author:Wendell Odom
Language: eng
Format: epub
Publisher: Cisco Press
Published: 2013-04-01T04:00:00+00:00

J-K

jitter, 128

just-left octet, 551

keyboard shortcuts, command help, 183

knowledge gaps, discovering through question review, 826-828

L

L3PDUs, 38, 95

L4PDUs, 122

labs

Config Museum labs, 830

practicing hands-on CLI skills, 829

LAN switching, frame forwarding logic, 148

flooding, 151

forwarding versus filtering, 149-150

internal switch processing, 153

loop avoidance, 152-153

MAC address learning process, 150-151

LANs. See also VLANs

campus LANs

access switches, 160

core switches, 161

distribution switches, 160

maximum cable lengths, 161-162

selecting Ethernet technology, 159-160

comparing with WANs, 67

connecting with WANs, 70

enterprise LANs, 19, 47-48

Ethernet

addressing, 59-60

broadcast domains, 156-158

collision domains, 147-148, 155-158

CSMA/CD, 64

data link layer standard, 49-50

data link protocols, 58

data transmission, 51

electrical circuits, creating over, 50

Ethernet links, 51-53

full-duplex data transmission, 62

half-duplex data transmission, 63

physical layer standards, 48-49

IP telephony, 129

SOHO, 46-47

subnets, IP address assignment, 311

wired LANs, 43

last usable address, deriving from classful network, 338-340

late collisions, 283

Layer 1, 74, 282-283

Layer 2 switches, 219, 243-245. See also data link layer

Layer 3. See also network layer

Layer 3 switching, 219, 243-246, 444-446

problem isolation, 272

routing between VLANs, 244-245

Layer 4 protocols, 36. See also transport layer

TCP, 121

connection establishment, 126-127

connection termination, 127

header fields, 121-122

multiplexing, 123-125

port numbers, 125

well-known port numbers, 125

UDP, 127

header format, 128

multiplexing, 123-125

port numbers, 125

well-known port numbers, 125

Layer 5, 36

Layer 6, 36

layers

adjacent-layer interactions, 26

encapsulation, 38

of OSI networking model, 32-38

problem isolation, 272

protocols, describing with, 35

remembering with mnemonics, 37

same-layer interactions, 26

leased circuits, 72

leased lines. See also WANs

cabling, 72-73

CPE, 73

data link layer protocols, HDLC, 74-76

Ethernet as WAN technology, 77-79

full-duplex operation, 71

Internet access technologies, 81

cable Internet, 84-85

DSL, 82-84

Layer 1 service, 74

links, 72

point-to-point links, 72

private lines, 72

serial links, 72

service providers, 71

T1, 72

leases (DHCP), 497

LED status indicators, 173, 175

LEDs (light-emitting diodes), 161

line aux 0 command, 419

line status, displaying with show interfaces command, 277

link layer (TCP/IP model), 22, 30-32

link-local addresses (IPv6), 744

creating, 745-746

listing, 744

link-local next-hop addresses to IPv6 static routes, 789

link-state routing protocols, 466

OSPF, 469

ABRs, 475

best route selection, 471

configuring, 476-480

default routes, 486-487

flooding process, 470-471

Hello process, 472

LSAs, 470-471

LSDB, 470-471

multiarea OSPF, 475

neighbors, 472

passive interfaces, 484-485

reinitializing, 484

RID, 473, 483-484

single-area OSPF, 474, 477-478

verifying configuration, 480-483

OSPFv3

LSDB, 803

neighbors, verifying, 801-802

passive interfaces, 798

single-area, 794-798

verifying, 798-804

links, 72-74

Linux OS, ifconfig command, 770

list logic, standard numbered IPv4 ACLs, 605

listing

IPv6 subnet IDs, 722

link-local addresses, 744

LLDP (Link Layer Discovery Protocol), 273

local routes, 439, 782-785

local-scope IPv6 multicast addresses, 747-748

local usernames

configuring on Cisco Catalyst switches, 206-207

password, hiding, 214

locations for CLI passwords, 641-642

log keyword (access-list command), 615

log messages, displaying, 216-217

logging synchronous command, 216-217

login authentication. See passwords

login command, 203

loop avoidance, STP, 152-53

loopback address, 340, 750

loopback interfaces, 483

loss, 128

LSAs (link-state advertisements), 470-471, 803

LSDB (link-state database), 470-471, 803

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