Xiao Lu · exam sorting

1) In the rhel5 system, the following command (c) can be used to view the route table information of the system

A) IP add list

B) show IP Route

C) Route-n

D) route -- print

Supplement: viewing Network Interface Information ifconfig

View network connection status netstat

Trace packet traceroute target host address

Domain name resolution NSLookup target host address

2) in Linux system log messages, the least important level is (C), indicating normal program or system debugging information.

A) emerg

B) Warning

C) debug

D) Notice

Supplement: 0 emerg (urgent): Causes unavailability of the host system

1 alert (warning): The problem must be resolved immediately

2 crit (severe): serious

3 err (error): running error

4 warning: events that may affect system functions

5 notice: it does not affect the system, but it is worth noting

6 info: General information

7 Debug: program or system debugging information

Note: the smaller the number level, the higher the priority, the more important the message

3) Which of the following is the new VPN protocol for Windows Server 2008? (c)

A) PPTP (Point-to-Point Tunneling Protocol)

B) L2TP (Layer 2 tunnel protocol)

C) sstp (Secure Socket tunnel protocol)

D) NNTP (network news transmission protocol)

 

VPN tunnel protocols include PPTP, L2TP, and IPSec. The PPTP and L2TP protocols work on the second layer of the OSI model; IPSec is the layer-3 tunnel protocol

Sstp can create a VPN tunnel transmitted over HTTPS to eliminate problems related to PPTP (Point-to-Point tunnel protocol) or L2TP (layer-2nd tunnel protocol) VPN connections. These protocols may be blocked by some Web Proxy, firewall, and network address translation (NAT) routers located between the client and the server.

This sstp is only applicable to remote access and does not support VPN tunnels between sites.

4) there must be no (d) router in the OSPF peripheral area.

A) Dr specified vro

B) BDR backup of the specified vro

C) The border router in the ABR Area

D) ASBR Autonomous System Border Router

 

Supplement:

OSPF consists of three subprotocols: Hello protocol, exchange protocol, and diffusion protocol. The Hello protocol is responsible for checking whether the link is available, and completing the specified vro and backing up the specified vro. The Exchange Protocol completes the designation of the "master" and "slave" vro and exchanges the information of their respective routing databases; the diffusion Protocol completes the synchronization maintenance of the routing database in each vro.

The ending area and the complete ending area meet the following four conditions:

Only one default route is used as the egress of the region.

The region cannot be used as the cross area of the virtual link.

No Autonomous System border router ASBR in stub Region

Area 0 is not the backbone area

No lsa4, 5, and 7 announcements in the peripheral area

No lsa3, 4, 5, and 7 notifications except for one lsa3 default route announcement in the completely ending Area

Type Code	Description	Purpose
Type 1	Router LSA	Issued by a vro IN THE REGION
Type 2	Network LSA	Issued by the DR in the region
Type 3	Network summary LSA	Summary link announcement for other regions issued by API
Type 4	ASBR summary LSA	The ASBR information issued by the API
Type 5	As external LSA	Issued by ASBR to advertise external routes
Type 7	NSSA external LSA	Issued by ASBR In The NSSA region to advertise external routes connected to the region

------ Go to bed. I will go home tomorrow evening to continue my work. Come on! Xiao Lu!