csci 434 please help

Question 16 (1 point) The Internet is aln) ( 1) core ISP (2) access ISP 3) content provider network 4) network of networks Question 17 (1 point) If the local name server cannot resolve the given host name in a query, it first contacts the server. 1) TLD 2) local DNS 3) authoritative DNS root DNS Question 18 (1 point) HTTP has a mechanism called are up to date. that allows a cache to verify that its objects 1) persistent HTTP 2) non-persistent HTTP 3) conditional HTTP 4) conditional GET Question 19 (1 point) Using address. it is possible to inject packets into the network with a false source 1) IP sniffing 2) IP spoofing 3) Trojan horse 4) keylogging Question 20 (1 point) Which of the following attack types is not one of the denial of service attacks? 1) Bandwidth flooding 2) Connection flooding 3) Vulnerability attack 4) Sniffing attack