Questions with Explanation
Q1: If an Ethernet port on router was assigned an IP address of 172.16.112.1/20, what is the maximum number of hosts allowed on this subnet? A. 1024 B. 2046 C. 4094 D. 4096 E. 8190 Answer: C Explanation: Given IP address of 172.16.112.1 / 20, subnet mask: 255.255.240.0 max. num of hosts =(( 2^12) -2 ) = 4096-2 = 4094 Q2.:An access list was written with the four statements shown in the graphic. Which single access list statement will combine all four of these statements into a single statements that will have exactly the same effect?
A. access-list 10 permit 172.29.16.0 0.0.0.255 B. access-list 10 permit 172.29.16.0 0.0.1.255 C. access-list 10 permit 172.29.16.0 0.0.3.255 D. access-list 10 permit 172.29.16.0 0.0.15.255 E. access-list 10 permit 172.29.0.0 0.0.255.255 Answer: C Explanation: 172.29.16.0 is an aggregate address for those 4 networks. If you would write all these addresses in binary form and will mark the equal part, than you will see that it is 172.29.16.0. Q3. Refer to the exhibit , what is the most efficient summarization that R1 can use to advertise its networks to R2?
A. 172.1.0.0/22 B. 172.1.0.0/21 C. 172.1.4.0/22 D. 172.1.4.0/24 172.1.5.0/24 172.1.6.0/24 172.1.7.0/24 E. 172.1.4.0/25 172.1.4.128/25 172.1.5.0/24 172.1.6.0/24172.1.7.0/24
Answer : C Explanation:Route Summarization Overview:In large internetworks, hundreds, or even thousands, of network addresses can exist. It is often problematic for routers to maintain this volume of routes in their routing tables. Route summarization (also called route aggregation or supernetting) can reduce the number of routes that a router must maintain, because it is a method of representing a series of network numbers in a single summary address.
For example, in the figure above, router D can either send four routing update entries or summarize the four addresses into a single network number. If router D summarizes the information into asingle network number entry, the following things happen: 1.
A. access-list 10 permit 172.29.16.0 0.0.0.255 B. access-list 10 permit 172.29.16.0 0.0.1.255 C. access-list 10 permit 172.29.16.0 0.0.3.255 D. access-list 10 permit 172.29.16.0 0.0.15.255 E. access-list 10 permit 172.29.0.0 0.0.255.255 Answer: C Explanation: 172.29.16.0 is an aggregate address for those 4 networks. If you would write all these addresses in binary form and will mark the equal part, than you will see that it is 172.29.16.0. Q3. Refer to the exhibit , what is the most efficient summarization that R1 can use to advertise its networks to R2?
A. 172.1.0.0/22 B. 172.1.0.0/21 C. 172.1.4.0/22 D. 172.1.4.0/24 172.1.5.0/24 172.1.6.0/24 172.1.7.0/24 E. 172.1.4.0/25 172.1.4.128/25 172.1.5.0/24 172.1.6.0/24172.1.7.0/24
Answer : C Explanation:Route Summarization Overview:In large internetworks, hundreds, or even thousands, of network addresses can exist. It is often problematic for routers to maintain this volume of routes in their routing tables. Route summarization (also called route aggregation or supernetting) can reduce the number of routes that a router must maintain, because it is a method of representing a series of network numbers in a single summary address.
For example, in the figure above, router D can either send four routing update entries or summarize the four addresses into a single network number. If router D summarizes the information into asingle network number entry, the following things happen: 1.