JN0-304单项选择题每日一练(2019.01.07)

单项选择题
Which mechanism does External BGP use to prevent the formation of routing loops?（）
A. AS path
B. Split horizon
C. Poison reverse
D. Unicast RPF check
单项选择题
Within a BGP confederation how are routing loops avoided?（）
A. split horizon
B. the AS-path attribute
C. the BGP cluster ID attribute
D. the BGP originator ID attribute
单项选择题
Given the following LSP configuration, which statement is true?（）label-switched-path lsp-xyz { to 10.200.1.1; primary path1; secondary path2; secondary path3; no-cspf; } path path1 { 10.200.10.1 strict; } path path2 { 10.200.20.1 strict; } path path3 { 10.200.30.1 loose; }
A. The router will use path1 when it is available and stable.
B. The router will use path3 when it is available and stable.
C. The router will attempt to establish path2 only when path1 and path3 are down.
D. The router will attempt to establish path1 only when path2 and path3 are down.
单项选择题
In JUNOS software, how is route summarization at the L1/L2 border configured?（）
A. by specifying the area-range statement
B. by creating aggregate routes and applying policies
C. by specifying the route-summarization statement
D. by specifying the area-range restrict statement
单项选择题
Which method should be used to dynamically elect an RP when your network is using PIM version1?（）
A. auto-RP
B. static RP
C. discovery mode
D. bootstrap protocol