【Answer】1. A 2. BCE 3. D 4. ABCD 5. AB,C
【Winner】phuta，Zebra，Malik3000，martial_L，BAZ
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Hello, everyone!
Join the Community Learning week Network Routing&Switching BGP topic!
Network class learning time of this phase: April 19th - April 24th.
Answer time of this class: April 21st, 2 AM - April 22nd, 10 AM (UTC+0)
Class topic
Post 1. Overview of BGP and BGP Characteristics
The Border Gateway Protocol (BGP) is a distance-vector routing protocol used to transmit routing information between ASs. It is an Exterior Gateway Protocol (EGP) and applicable to large-scale networks, enabling the Internet backbone network to transmit such a large number of route prefixes... More
Post 2. BGP Path Attributes Preferred-value, LP, AS-PATH, Origin
BGP has rich path attributes. When a BGP router updates a route to its peers, it transmits multiple paths attributes along with the route to the peers. The path attributes affect BGP route selection and greatly enhance the BGP routing policy... More
Post 3. BGP Path Attributes AS-PATH
AS-PATH is a well-known mandatory attribute that describes the ASs through which a route passes from the local device to the destination. The AS-PATH attribute has two important functions: preventing loops between ASs and choosing an optimal route... More
Post 4. Using Route-Policy in BGP
Route-policy plays an important role in BGP policy deployment. It is one of the most important basic tools of BGP and can be used to configure BGP routing policies (setting BGP route attributes) or to filter routes... More
Post 5. BGP RR
BGP uses the AS_Path attribute to prevent routing loops between ASs. To prevent routing loops within an AS, BGP defines an IBGP split-horizon rule that each BGP router does not transmit the BGP routes learned from an IBGP peer to other IBGP peers... More
Class Questions
After attending this class, please answer the following questions and comment with the answers below this post.
1. BGP uses TCP (port 179) to ensure reliable transmission. BGP neighbors exchange their entire BGP routing tables after establishing a peering relationship.
A.True
B.False
2. (Multiple-Choices Question)Which of the following attributes are well-known mandatory attributes?
A. Community
B. Next_hop
C. Origin
D. MED
E. AS_Path
3. Which of the following attributes are used to prevent loops between BGP ASs?
A. Next hop
B. Weight
C. MED
D. AS_Path
4. (Multiple-Choices Question)Which of the following BGP commands can invoke route-policy to implement BGP policies?
A. peer
B. dampening
C. network
D. import-route
5. (Multiple-Choices Question)Which of the following are route reflection rules?
A. If a route is learned from a non-client IBGP peer, the route is reflected to all clients.
B. If a route is learned from a client, the route is reflected to other clients and all non-client IBGP peers.
C. If a route is learned from an EBGP peer, the route is sent to all clients and non-client IBGP peers.
Hope you get good grades, come and enjoy this learning party! 
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