R1 configuration
[r1]int g0/0/0
[r1-GigabitEthernet0/0/0]ip add 192.168.1.1 24
[r1-GigabitEthernet0/0/0]int s4/0/0
[r1-Serial4/0/0]ip add 12.1.1.1 24Able to write static data on the Internet
[r1]ip route-static 0.0.0.0 0 12.1.1.2
[r1-acl-basic-2000]rule 1 permit source any
[r1-acl-basic-2000]int s4/0/0
[r1- Serial4/0/0] nat outbound 2000
R2 configuration
[r2]int s4/0/0
[r2-Serial4/0/0]ip add 12.1.1.2 24
[r2-Serial4/0/0]int s4/0/1
[r2-Serial4/0/1]ip add 23.1.1.2 24
[r2-Serial4/0/1]int s3/0/0
[r2-Serial3/0/0]ip add 42.1.1.2 24
[r2-Serial3/0/0]int l0
[r2-LoopBack0]ip add 2.2.2.2 24
R3 configuration
[r3]int s4/0/0
[r3-Serial4/0/0]ip add 12.1.1.2 24
[r3-Serial4/0/0]ip add 32.1.1.3 24
[r3-Serial4/0/0]int g0/0/0
[r3-GigabitEthernet0/0/0]ip add 192.168.3.1 24Can write static on the Internet
[r3]ip route-static 0.0.0.0 0 32.1.1.2
[r3]acl 2000
[r3-acl-basic-2000]rule 1 permit source any
[r3-acl-basic-2000]int s4/0 /0
[r3-Serial4/0/0] nat outbound 2000
R4 configuration
[r4]int g0/0/0
[r4-GigabitEthernet0/0/0]ip add 192.168.4.1 24
[r4-GigabitEthernet0/0/0]int s4/0/0
[r4-Serial4/0/0]ip add 42.1.1.4 24Ability to write static data online
[r4]ip route-static 0.0.0.0 0 42.1.1.2
[r4]acl 2000
[r4-acl-basic-2000]rule 1 permit source any
[r4]int s4/0/0
[r4-Serial4/0/0]nat outbound 2000
Question 1
HDLc package between R1-R2
[r1-Serial4/0/0]link-protocol hdlc
Warning: The encapsulation protocol of the link will be changed. Continue? [Y/N]
:y
[r2-Serial4/0/0]link-protocol hdlc
Warning: The encapsulation protocol of the link will be changed. Continue? [Y/N]
:y
Question 2
PPP encapsulation between R2-R3, pap authentication, R2 is the main authenticator
primary authenticator
[r2]aaa
[r2-aaa]local-user huawei password cipher huawei
[r2-aaa]local-user huawei service-type ppp
[r2-aaa]int s4/0/1
[r2-Serial4/0/1]ppp authentication-mode
paptranslation[r3]int s4/0/0
[r3-Serial4/0/0]ppp pap local-user huawei password cipher huawei
Question 3
R2-R4 is PPP encapsulation, chap authentication, R2 is the main authenticator
primary authenticator
[r2]aaa
[r2-aaa]local-user huawei password cipher huawei
[r2-aaa]local-user huawei service-type ppp
[r2-aaa]int s3/0/0
[r2-Serial4/0/1]ppp
authentication -mode chap[r4]int s4/0/0
[r4-Serial4/0/0]ppp chap user huawei
[r4-Serial4/0/0]ppp chap password cipher huawei
Question 4
R1, R2, and R3 build an MGRE environment, and only the IP address of R1 is fixed
[r1]int t0/0/0
[r1-Tunnel0/0/0]tunnel-protocol gre p2mp
[r1-Tunnel0/0/0]ip add 10.1.1.1 24
[r1-Tunnel0/0/0]nhrp network-id 100
[r1-Tunnel0/0/0]source 12.1.1.1[r2-Tunnel0/0/0]ip add 10.1.1.2 24
[r2-Tunnel0/0/0]tunnel-protocol gre p2mp
[r2-Tunnel0/0/0]nhrp network-id 100
[r2-Tunnel0/0/0]source s4/0/0
[r2-Tunnel0/0/0]nhrp entry 10.1.1.1 12.1.1.1 register[r3]int t0/0/0
[r3-Tunnel0/0/0]ip add 10.1.1.3 24
[r3-Tunnel0/0/0]tunnel-protocol gre p2mp
[r3-Tunnel0/0/0]source s4/0/0
[r3-Tunnel0/0/0]nhrp network-id 100
[r3-Tunnel0/0/0]nhrp entry 10.1.1.1 12.1.1.1 register
Question 5
The internal network uses RIP to obtain routes, all PCs can access each other, and can access the loopback of R2
[r1-Tunnel0/0/0]nhrp entry multicast dynamic Enable pseudo broadcast
[r1-Tunnel0/0/0]undo rip split-horizon Disable horizontal split
[r1-Tunnel0/0/0]q
[r1]rip 1
[r1 -rip-1]version 2
[r1-rip-1]network 192.168.1.0
[r1-rip-1]network 10.0.0.0[r3]rip 1
[r3-rip-1]version 2
[r3-rip-1]network 192.168.2.0
[r3-rip-1]network 10.0.0.0
[r4]rip 1
[r4-rip-1]version 2
[r4-rip-1]network 192.168.4.0
[r4-rip-1]network 10.0.0.0