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CCNA RS_ITN - Chapter 6
1.
Chapter 6: Network
Layer Introduction to Networks © 2008 Cisco Systems, Inc. All Presentation_ID rights reserved. Cisco Confidential 1
2.
Chapter 6: Objectives
Students will be able to: Explain how network layer protocols and services support communications across data networks. Explain how routers enable end-to-end connectivity in a small to medium-sized business network. Determine the appropriate device to route traffic in a small to medium-sized business network. Configure a router with basic configurations. Presentation_ID © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential 2
3.
Chapter 6 6.1
Network Layer Protocols 6.2 Routing 6.3 Routers 6.4 Configuring a Cisco Router 6.5 Summary Presentation_ID © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential 3
4.
Network Layer Network
Layer Presentation_ID © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential 4
5.
Network Layer Protocols
Network Layer in Communication Presentation_ID © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential 5
6.
Network Layer in
Communication The Network Layer End to End Transport processes Addressing end devices Encapsulation Routing De-encapsulating Presentation_ID © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential 6
7.
Network Layer in
Communication Network Layer Protocols Common Network Layer Protocols Internet Protocol version 4 (IPv4) Internet Protocol version 6 (IPv6) Legacy Network Layer Protocols Novell Internetwork Packet Exchange (IPX) AppleTalk Connectionless Network Service (CLNS/DECNet) Presentation_ID © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential 7
8.
Characteristics of the
IP protocol Characteristics of IP Presentation_ID © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential 8
9.
Characteristics of the
IP protocol IP - Connectionless Presentation_ID © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential 9
10.
Characteristics of the
IP protocol IP – Best Effort Delivery Presentation_ID © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential 10
11.
Characteristics of the
IP protocol IP – Media Independent Presentation_ID © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential 11
12.
IPv4 Packet Encapsulating
IP Presentation_ID © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential 12
13.
IPv4 Packet IPv4
Packet Header Version, Differentiated Services (DS), Time-to-Live (TTL),Protocol, Source IP Address, Destination IP Address Byte 1 Byte 2 Byte 3 Byte 4 Version IP Header Length Differentiated Services Total Length DSCP ECN Identification Flag Fragment Offset Time To Live Protocol Header Checksum Source IP Address Destination IP Address Options (optional) Padding Presentation_ID © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential 13
14.
IPv4 Packet IPv4
Header Fields Internet Header Length (IHL), Total Length, Header Checksum, Identification, Flags, Fragment Offset Byte 1 Byte 2 Byte 3 Byte 4 Version IP Header Length Differentiated Services Total Length DSCP ECN Identification Flag Fragment Offset Time To Live Protocol Header Checksum Source IP Address Destination IP Address Options (optional) Padding Presentation_ID © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential 14
15.
IPv4 Packet Sample
IPv4 Headers Presentation_ID © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential 15
16.
Network Layer in
Communication Limitations of IPv4 IP Address depletion Internet routing table expansion Lack of end-to-end connectivity Presentation_ID © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential 16
17.
Network Layer in
Communication Introducing IPv6 Increased address space Improved packet handling Eliminates the need for NAT Integrated security 4 billion IPv4 addresses 4,000,000,000 340 undecillion IPv6 addresses 340,000,000,000,000,000,000,000,000,000,000,000,000 Presentation_ID © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential 17
18.
IPv6 Packet Encapsulating
IPv6 Presentation_ID © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential 18
19.
IPv6 Packet IPv6
Packet Header Byte 1 Byte 2 Byte 3 Byte 4 Version Traffic Class Flow Label Payload Length Next Header Hop Limit Source IP Address Destination IP Address Presentation_ID © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential 19
20.
IPv6 Packet Sample
IPv6 Header Presentation_ID © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential 20
21.
Routing Host Routing
Tables Presentation_ID © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential 21
22.
Host Routing Tables
Host Packet Forwarding Decision Presentation_ID © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential 22
23.
Host Routing Tables
Default Gateway Hosts must maintain their own, local, routing table to ensure that network layer packets are directed to the correct destination network. The local table of the host typically contains: Direct connection Local network route Local default route R Presentation_ID © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential 23
24.
Host Routing Tables
IPv4 Host Routing Table Presentation_ID © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential 24
25.
Host Routing Tables
Sample IPv4 Host Routing Table Presentation_ID © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential 25
26.
Host Routing Tables
Sample IPv6 Host Routing Table Presentation_ID © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential 26
27.
Router Routing Tables
Router Packet Forwarding Decision Presentation_ID © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential 27
28.
Router Routing Tables
IPv4 Router Routing Table 192.168.10.0/24 R2 192.168.11.0/24 10.1.1.0/24 10.1.2.0/24 209.165.200.224 /30 .226 .10 .10 .1 .225 S0/0/0 G0/0 .1 R1 .1 .1 G0/1 R1#show ip route Codes: L - local, C - connected, S - static, R - RIP, M - mobile, B - BGP D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2 E1 - OSPF external type 1, E2 - OSPF external type 2, E - EGP i - IS-IS, L1 - IS-IS level-1, L2 - IS-IS level-2, ia - IS-IS inter area * - candidate default, U - per-user static route, o - ODR P - periodic downloaded static route Gateway of last resort is not set 10.0.0.0/8 is variably subnetted, 2 subnets, 2 masks D 10.1.1.0/24 [90/2170112] via 209.165.200.226, 00:00:05, Serial0/0/0 D 10.1.2.0/24 [90/2170112] via 209.165.200.226, 00:00:05, Serial0/0/0 192.168.10.0/24 is variably subnetted, 2 subnets, 3 masks C 192.168.10.0/24 is directly connected, GigabitEthernet0/0 L 192.168.10.1/32 is directly connected, GigabitEthernet0/0 192.168.11.0/24 is variably subnetted, 2 subnets, 3 masks C 192.168.11.0/24 is directly connected, GigabitEthernet0/1 L 192.168.11.1/32 is directly connected, GigabitEthernet0/1 209.165.200.0/24 is variably subnetted, 2 subnets, 3 masks C 209.165.200.224/30 is directly connected, Serial0/0/0 L 209.165.200.225/32 is directly connected, Serial0/0/0 R1# .10 .10 PC1 PC2 Presentation_ID © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential 28
29.
Router Routing Tables
Directly Connected Routing Table Entries 192.168.10.0/24 64.100.0.1 R2 192.168.11.0/24 10.1.1.0/24 10.1.2.0/24 209.165.200.224 /30 .226 .10 .10 .1 .1 G0/0 .1 .1 G0/1 .225 S0/0/0 R1 A B C .10 .10 C 192.168.10.0/24 is directly connected, GigabitEthernet0/0 L 192.168.10.1/32 is directly connected, GigabitEthernet0/0 A Identifies how the network was learned by the router. B Identifies the destination network and how it is connected. C Identifies the interface on the router connected to the destination network. PC1 PC2 Presentation_ID © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential 29
30.
Router Routing Tables
Remote Network Routing Table Entries 192.168.10.0/24 64.100.0.1 R2 192.168.11.0/24 10.1.1.0/24 10.1.2.0/24 209.165.200.224 /30 .226 .10 .10 .10 .10 .1 .1 G0/0 .1 .1 G0/1 .225 S0/0/0 R1 PC1 PC2 D 10.1.1.0/24 [90/2170112] via 209.165.200.226, 00:00:05, Serial0/0/0 A Identifies how the network was learned by the router. B Identifies the destination network. C Identifies the administrative distance (trustworthiness) of the route source. D Identifies the metric to reach the remote network. E Identifies the next hop IP address to reach the remote network. F Identifies the amount of elapsed time since the network was discovered. G Identifies the outgoing interface on the router to reach the destination network. Presentation_ID © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential 30
31.
Router Routing Tables
Next-Hop Address 192.168.10.0/24 64.100.0.1 R2 192.168.11.0/24 10.1.1.0/24 10.1.2.0/24 209.165.200.224 /30 .226 .10 .10 .10 .10 .1 .1 G0/0 .1 .1 G0/1 .225 S0/0/0 R1 PC1 PC2 R1#show ip route Codes: L - local, C - connected, S - static, R - RIP, M - mobile, B - BGP D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2 E1 - OSPF external type 1, E2 - OSPF external type 2, E - EGP i - IS-IS, L1 - IS-IS level-1, L2 - IS-IS level-2, ia - IS-IS inter area * - candidate default, U - per-user static route, o - ODR P - periodic downloaded static route Gateway of last resort is not set 10.0.0.0/8 is variably subnetted, 2 subnets, 2 masks D 10.1.1.0/24 [90/2170112] via 209.165.200.226, 00:00:05, Serial0/0/0 D 10.1.2.0/24 [90/2170112] via 209.165.200.226, 00:00:05, Serial0/0/0 192.168.10.0/24 is variably subnetted, 2 subnets, 3 masks C 192.168.10.0/24 is directly connected, GigabitEthernet0/0 L 192.168.10.1/32 is directly connected, GigabitEthernet0/0 192.168.11.0/24 is variably subnetted, 2 subnets, 3 masks C 192.168.11.0/24 is directly connected, GigabitEthernet0/1 L 192.168.11.1/32 is directly connected, GigabitEthernet0/1 209.165.200.0/24 is variably subnetted, 2 subnets, 3 masks C 209.165.200.224/30 is directly connected, Serial0/0/0 L 209.165.200.225/32 is directly connected, Serial0/0/0 R1# Presentation_ID © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential 31
32.
Routers Anatomy of
a Router Presentation_ID © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential 32
33.
Anatomy of a
Router A Router is a Computer Presentation_ID © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential 33
34.
Anatomy of a
Router Router CPU and OS Presentation_ID © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential 34
35.
Anatomy of a
Router Router Memory Memory Volatile / Non-Volatile Stores RAM Volatile • Running IOS • Running configuration file • IP routing and ARP tables • Packet buffer ROM Non-Volatile • Bootup instructions • Basic diagnostic software • Limited IOS NVRAM Non-Volatile • Startup configuration file Flash Non-Volatile • IOS • Other system files Presentation_ID © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential 35
36.
Anatomy of a
Router Inside a Router Presentation_ID © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential 36
37.
Anatomy of a
Router Router Backplane Double-wide eHWIC slots eHWIC 0 AUX Two 4 GB flash card slots port LAN interfaces USB Ports Console RJ45 Console USB Type B Presentation_ID © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential 37
38.
Anatomy of a
Router Connecting to a Router WAN Interface AUX port LAN interfaces Console RJ45 Console USB Type B Presentation_ID © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential 38
39.
Anatomy of a
Router LAN and WAN Interfaces Serial interfaces LAN interfaces Presentation_ID © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential 39
40.
Router Boot-up Cisco
IOS Presentation_ID © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential 40
41.
Router Boot-up Bootset
Files Presentation_ID © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential 41
42.
Router Boot-up Router
Bootup Process 1.Perform the POST bootstrap program 2.Locate and load the Cisco IOS software 3.Locate and load the startup configuration System Bootstrap, Version 15.0(1r)M15, RELEASE SOFTWARE (fc1) Technical Support: http://www.cisco.com/techsupport <output omitted> and load the file or enter setup mode Presentation_ID © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential 42
43.
Router Boot-up Show
Versions Output Router# show version Cisco IOS Software, C1900 Software (C1900-UNIVERSALK9-M), Version 15.2(4)M1, RELEASE SOFTWARE (fc1) Technical Support: http://www.cisco.com/techsupport Copyright (c) 1986-2012 by Cisco Systems, Inc. Compiled Thu 26-Jul-12 19:34 by prod_rel_team ROM: System Bootstrap, Version 15.0(1r)M15, RELEASE SOFTWARE (fc1) Router uptime is 10 hours, 9 minutes System returned to ROM by power-on System image file is "flash0:c1900-universalk9-mz.SPA.152-4.M1.bin" Last reload type: Normal Reload Last reload reason: power-on <Output omitted> Cisco CISCO1941/K9 (revision 1.0) with 446464K/77824K bytes of memory. Processor board ID FTX1636848Z 2 Gigabit Ethernet interfaces 2 Serial(sync/async) interfaces 1 terminal line DRAM configuration is 64 bits wide with parity disabled. 255K bytes of non-volatile configuration memory. 250880K bytes of ATA System CompactFlash 0 (Read/Write) <Output omitted> Technology Package License Information for Module:'c1900' ----------------------------------------------------------------- Technology Technology-package Technology-package Current Type Next reboot ------------------------------------------------------------------ ipbase ipbasek9 Permanent ipbasek9 security None None None data None None None Configuration register is 0x2142 (will be 0x2102 at next reload) Router# Presentation_ID © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential 43
44.
Network Layer Configuring
a Cisco Router Presentation_ID © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential 44
45.
Configure Initial Settings
Router Configuration Steps 192.168.10.0/24 192.168.11.0/24 209.165.200.224 /30 .10 .10 .225 S0/0/0 G0/0 .1 R1 .1 .1 G0/1 PC1 PC2 Router> enable Router# configure terminal Enter configuration commands, one per line. End with CNTL/Z. Router(config)# hostname R1 R1(config)# R2 10.1.1.0/24 10.1.2.0/24 .226 .10 .10 .1 Router> en Router# conf t Enter configuration commands, one per line. End with CNTL/Z. Router(config)# ho R1 R2(config)# OR R1(config)# enable secret class R1(config)# R1(config)# line console 0 R1(config-line)# password cisco R1(config-line)# login R1(config-line)# exit R1(config)# R1(config)# line vty 0 4 R1(config-line)# password cisco R1(config-line)# login R1(config-line)# exit R1(config)# R1(config)# service password-encryption R1(config)# R1(config)# banner motd # Enter TEXT message. End with the character '#'. *********************************************** WARNING: Unauthorized access is prohibited! *********************************************** # R1(config)# R1# copy running-config startup-config Destination filename [startup-config]? Building configuration... [OK] R1# Presentation_ID © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential 45
46.
Configure Interfaces Configure
LAN Interfaces 192.168.10.0/24 R2 192.168.11.0/24 10.1.1.0/24 10.1.2.0/24 209.165.200.224 /30 .226 .10 .10 .10 .10 .1 .225 S0/0/0 G0/0 .1 R1 .1 .1 G0/1 PC1 PC2 R1# conf t Enter configuration commands, one per line. End with CNTL/Z. R1(config)# R1(config)# interface gigabitethernet 0/0 R1(config-if)# ip address 192.168.10.1 255.255.255.0 R1(config-if)# description Link to LAN-10 R1(config-if)# no shutdown %LINK-5-CHANGED: Interface GigabitEthernet0/0, changed state to up %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet0/0, changed state to up R1(config-if)# exit R1(config)# R1(config)# int g0/1 R1(config-if)# ip add 192.168.11.1 255.255.255.0 R1(config-if)# des Link to LAN-11 R1(config-if)# no shut %LINK-5-CHANGED: Interface GigabitEthernet0/1, changed state to up %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet0/1, changed state to up R1(config-if)# exit R1(config)# Presentation_ID © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential 46
47.
Configure Interfaces Verify
Interface Configuration 192.168.10.0/24 R2 192.168.11.0/24 10.1.1.0/24 10.1.2.0/24 209.165.200.224 /30 .226 .10 .10 .10 .10 .1 .225 S0/0/0 G0/0 .1 R1 .1 .1 G0/1 PC1 PC2 R1# show ip interface brief Interface IP-Address OK? Method Status Protocol GigabitEthernet0/0 192.168.10.1 YES manual up up GigabitEthernet0/1 192.168.11.1 YES manual up up Serial0/0/0 209.165.200.225 YES manual up up Serial0/0/1 unassigned YES NVRAM administratively down down Vlan1 unassigned YES NVRAM administratively down down R1# R1# ping 209.165.200.226 Type escape sequence to abort. Sending 5, 100-byte ICMP Echos to 209.165.200.226, timeout is 2 seconds: !!!!! Success rate is 100 percent (5/5), round-trip min/avg/max = 1/2/9 ms R1# Presentation_ID © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential 47
48.
Configuring a Cisco
Router Configuring the Default Gateway Presentation_ID © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential 48
49.
Configuring the Default
Gateway Default Gateway on a Host 192.168.10.0/24 192.168.11.0/24 .1 G0/0 R1 G0/1 .1 .10 PC1 .10 PC2 .10 .10 PC3 PC4 192.168.10.0/24 192.168.11.0/24 .1 G0/0 R1 G0/1 .1 .10 PC1 .11 PC2 .10 .11 PC3 PC4 Presentation_ID © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential 49
50.
Configuring the Default
Gateway Default Gateway on a Switch 192.168.11.0/24 .1 G0/1 .1 192.168.10.0/24 G0/0 R1 .10 PC1 .11 PC2 S1#show running-config Building configuration... ! <output omitted> service password-encryption ! hostname S1 ! Interface Vlan1 ip address 192.168.10.50 ! ip default-gateway 192.168.10.1 <output omitted> S1 S2 .50 If the default gateway were not configured on S1, response packets from S1 would not be able to reach the administrator at 192.168.11.10. The administrator would not be able to mange the device remotely. Presentation_ID © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential 50
51.
Network Layer Summary
In this chapter, you learned: The network layer, or OSI Layer 3, provides services to allow end devices to exchange data across the network. The network layer uses four basic processes: IP addressing for end devices, encapsulation, routing, and de-encapsulation. The Internet is largely based on IPv4, which is still the most widely-used network layer protocol. An IPv4 packet contains the IP header and the payload. The IPv6 simplified header offers several advantages over IPv4, including better routing efficiency, simplified extension headers, and capability for per-flow processing. Presentation_ID © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential 51
52.
Network Layer Summary
In this chapter, you learned: In addition to hierarchical addressing, the network layer is also responsible for routing. Hosts require a local routing table to ensure that packets are directed to the correct destination network. The local default route is the route to the default gateway. The default gateway is the IP address of a router interface connected to the local network. When a router, such as the default gateway, receives a packet, it examines the destination IP address to determine the destination network. Presentation_ID © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential 52
53.
Network Layer Summary
In this chapter, you learned: The routing table of a router stores information about directly-connected routes and remote routes to IP networks. If the router has an entry in its routing table for the destination network, the router forwards the packet. If no routing entry exists, the router may forward the packet to its own default route, if one is configured, or it will drop the packet. Routing table entries can be configured manually on each router to provide static routing or the routers may communicate route information dynamically between each other using a routing protocol. In order for routers to be reachable, the router interface must be configured. Presentation_ID © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential 53
54.
Presentation_ID © 2008
Cisco Systems, Inc. All rights reserved. Cisco Confidential 54