ccna routing and switching salary

ccna routing and switching salary.1. the BoTCP/IP protocol stack contains four layers: the network access layer, the Internet layer, the transport layer, and the application layer. a, c, and d are incorrect.2. coIP does not provide a data recovery feature; if such a feature is needed, TCP can be used. a, b, and d are correct and therefore not the correct answer.3. the host portion of a DoA class address is 24 bits and the network portion is 8 bits. a is correct for a class C address; b is correct for a class B address; c is only likely to be correct for a class A address that has been subnetted and a class B address.Bo191.75.39.24 is a class B address. the value of the first byte of a class B address is 128.191; the value of the first byte of a class A address is 1.126; and the value of the first byte of a class C address is 192.223. since one answer is correct, D is incorrect. 5.A, B, and C are incorrect because one answer is correct.A is incorrect because 289 cannot be represented by one byte (the maximum value it can represent is 255); B is incorrect because the reserved class B private address is 172.16.0.0.72.31.255.255; and C is incorrect because the reserved class C private address is 192.168.0.0.192.168.255.255. .7. coping uses the ICMP protocol, which runs at layer 3 (network or Intemet layer), to discover problems at layer 3 or lower. a, b, and d are incorrect because ICMP runs at the network layer.8. bo next-hop layer 3 device responds using the MAC address of the NIC connected to the source device. a is incorrect because this is the MAC address of the source device. c and d are incorrect because these MAC addresses are not in the network segment/broadcast domain where the source device (PC-A) is located.TCP/IP Tools for WindowsPC 9. co127.0.0.1 is a loopback address that indicates the current device. If you can successfully ping this address, you have the TCP/IP stack correctly installed on the current device. a and b are incorrect because 127.0.0.1 indicates the current host, not another device. d is incorrect because to check connectivity to a DNS server or default gateway, you would ping the addresses of those devices.Bo If the first sendback request times out while all other sendback requests succeed, it usually indicates that the first sendback request times out because the devices in each segment/broadcast domain performed the ARP process to communicate. a is incorrect because DHCP is used to obtain addressing information, not to check connectivity; c is incorrect because if the router does not have a path to the destination device, then for ping A is incorrect because DHCP is used to obtain addressing information rather than to check connectivity; C is incorrect because if the router does not have a path to the target device, the router discards every return request sent by ping and sends a "target device unreachable" message; and D is incorrect because ping runs at the Internet layer rather than the application layer.