1. Which of the following routing protocols has the highest priority? (multiple choice)
A、Static
B、RIP
C、OSPF
D、Direct
Reference answer: D
Parse:
In the routing protocol, the smaller the pre value, the higher the priority
The default priority of each routing protocol in Huawei products is as follows
2. The following description about static and dynamic routing is wrong ( ). (multiple choice)
A. After the administrator deploys the dynamic routing protocol in the enterprise network, later maintenance and expansion can be more convenient
B. Dynamic routing protocols take up more system resources than static routing
C. After a link failure occurs, static routing can automatically complete network convergence
D. Static routing is easy to configure and easy to manage when it is applied in the enterprise
Reference answer: C
Parse:
Static routing is a routing entry manually written by the administrator, while dynamic routing is a routing protocol such as OSPF that automatically learns and updates routing entries.
It is precisely because dynamic routing can automatically learn and update automatically, so later maintenance and expansion are more convenient
When a link fails, dynamic routing can also detect the fault and automatically switch to an alternative path to complete network convergence. Static routing does not automatically detect faults and update because it is manually configured.
However, when dynamic routing works, it will definitely consume the computing resources of the device and occupy a certain amount of network bandwidth.
Static routing configuration is simple, while dynamic routing configuration needs to consider many factors (such as OSPF area division, etc.)
3. In the network shown in the figure below, the network administrator hopes that the data packets sent by host A to host B pass through the G0/0/3 interface between routers when the network administrator performs traffic planning, and the data packets sent by host B to host A pass through the router Which of the following commands can meet this requirement on the G0/0/4 interface? (multiple choice)
A. RTA : ip route-static 10.0.12.5 255. 255. 255. 252 11.0.12. 2
RTB : ip route-static 10.0.12.1 255. 255. 255. 252 11.0.12. 5
B. RTA : ip route-static 10.0.12.5 255.255.255.252 11.0.12.6
RTB : ip route-static 10.0.12.1 255.255.255.252 11.0.12.1
C. RTA : ip route-static 0.0.0.0 0.0.0.0 11.0. 12. 6
RTB : ip route-static 0.0.0.0 0.0.0.0 11.0. 12. 1
D. RTA : ip route-static 0.0.0.0 0.0.0.0 11.0. 12.2
RTB : ip route-static 0.0.0.0 0.0.0.0 11.0. 12.5
Reference answer: AC
Parse:
When the router receives the data packet, it will check the destination IP of the data packet, then check the routing table, and forward according to the routing entry matching the destination IP of the data packet
And the routing entry with 8 0s represents the default route. When no other routing entry matches, it will be forwarded according to the default route.
The command syntax of static routing is: ip route-static target network segment next hop IP
Therefore, both answers A and C can meet the routing requirements of the question.
4. As shown in the figure below. Which network device can host A and host B use to communicate? (multiple choice)
A. hub
B. Layer 2 switch
C. Router
D、HUB
Reference answer: C
Parse:
The router can realize communication on different network segments, where the two hosts are on different network segments
5. In the network shown in the figure below, all links are Ethernet links, and all interfaces of all routers run the 0SPF protocol. How many DRs are elected in the entire network? (multiple choice)
A、3
B、4
C、2
D、1
Reference answer: B
If in an OSPF area, the interfaces of all routers are in the same network segment, then select a DR
If each router interface is on a different network segment, then there are several network segments, and there will be several DRs
There are 4 network segments here, so 4 DRs will be selected
6. On the broadcast network, both DR and BDR use the multicast address 224.0.0.6 to receive link state update messages. (True or False)
A、True
B、False
Reference answer: A
It is clearly stated in the OSPF RFC document, the following is the original text
This multicast address has been assigned the value 224.0.0.6. Both the Designated Router and Backup Designated Router must be prepared to receive packets destined to this address.
7. What are the stable states of OSPF protocol neighbor relationship? (multiple choice)
A、Attempt
B、Down
C、Full
D、2-way
Reference answer: CD
In OSPF, neighbor (2-way) and adjacency (full) are stable states, down is neighbor failure, and others are intermediate states
8. Which of the following network types does the OSPF protocol support? (multiple choice)
A. NBMA
B. Broadcast type
C. Point-to-point type
D. point to multipoint
Reference answer: ABCD
Analysis: OSPF supports various network types, but under different network types, the default working mode is different, such as whether to choose DR, the default hello time, etc. are different
9. 192.168.1.127/25 represents the ( ) address. (multiple choice)
A. Internet
B. Broadcasting
C. Multicast
D. Host
Reference answer: B
Analysis, replace the IP address of the title with binary, you can see that the host bits are all 1, so it is a broadcast address
If the host bits are all 0, it is the subnet address (also called network number, network address)
Note: /25 means that the first 25 bits of the address are network bits, and the latter are host bits
10. The figure below shows the routing table of a certain router. When the router receives a data packet with the destination IP address 9.1.1.1, the router will forward it according to the route of 9.1.0.0/16, because the route matches the destination Address 9.1.1.1 has more bits. (True or False)
A. True
B.False
Reference answer: A
Parse:
When multiple routes are matched, the priority comparison principle is
Look at the mask first, the longest mask is the most accurate route first
If there are entries with the same mask length, look at the preference again, the one with the smallest value is preferred
If the mask and pre are the same, look at the cost again, the one with the smallest value is preferred
are all the same, an equivalent route is formed
In this question, there are 3 routes that can match 9.1.1.1 . According to the routing selection rules, the routing entry with the longest mask will be used
11. Which of the following statements is incorrect ( ). (Multiple choice)
A. If the cost value of the route entry is larger, the priority domain of the route is higher
B. The priority of each static route can be different
C. By default, direct routes have higher priority than OSPF routes
D. In VRP, the greater the priority value of the routing protocol, the higher the priority of the route
Reference answer: AD
Parse:
Static routing can manually set the preference, so each static routing specifies a different preference, and the priority is different. This method is often used in projects to implement the master and backup of static routing, also known as floating static routing.
The relevant principles of other options are analyzed in the previous topic.
12. In the network shown in the figure below, which of the following commands can be entered on the router so that host A can ping host B through? (multiple choice)
A. RTA : ip route-static 10.0.12.5 255.255. 255. 252 11.0.12.2
RTB : ip route-static 10.0.12.1 255. 255. 255.252 11.0.12.1
B. RTA : ip route-static 0.0.0.0 0.0.0.0 11.0.12.1
RTB : ip route-static 0.0.0.0 0.0.0.0 11.0. 12.2
C. RTA : ip route-static 10.0.12.5 255.255.255.252 11.0.12.1
RTB : ip route-static 10.0.12.1 255. 255.255.252 11.0.12.2
D. RTA : ip route-static 0.0.0.0 0.0.0.0 11.0. 12.2
RTB : ip route-static 0.0.0.0 0.0.0.0 11.0. 12.1
Reference answer: AD
Analysis: This question examines the principle of static routing, and there is an analysis before the use of static routing.
But note that there is a small error in the picture of this question, host B should be segment 10, and the gateway is also the address of G0/0/2 corresponding to the router RTB .
13. On the VRP operating platform, which of the following commands can only view static routes? (multiple choice)
- display ip routinelxable statistics
- display ip routing-table protocol static
- display ip routing-table verbose
- display ip routing-table
Reference answer: B
Parse:
On the Huawei VRP operating platform, the commands to view different types of routes are as follows
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