| A | B |
|---|
| ping and trace | commands used to verify IP address configuration |
| A host address of all 1s is reserved for | an IP broadcast into that network |
| A host value of 0 means | "this network" or "the wire itself" |
| A purpose of an IP address and a subnet mask on an interface | enable the system to process the receipt and transmission of packets |
| Directed broadcasts | to a specific network/subnet , are forwarded by the router and contain all 1s in the host portion |
| Flooded broadcasts | not propagated, but are considered local broadcasts and have 1s in all bits |
| The "/n " format | Used to indicate the number of routing bits (network and subnet bits) in each subnet mask |
| Router(config-if)# ip address | command to establish the logical network address of an interface. |
| Router# term ip netmask-format | command to specify the format of network masks for the current session |
| dotted-decimal | Format options default of the Router# term ip netmask-format command |
| Router (config)# ip host | command makes a static name-to-address entry in the router's configuration file |
| Router (config)# ip name-server | command defines which hosts can provide the name service |
| six | maximum number of IP addresses you can specify as name servers in a single command |
| To map domain names to IP addresses, you must | identify the host names, specify a name server, and enable DNS |
| When the operating system software receives a host name it does not recognize | it refers to DNS for the IP address of that device |
| router(config)# no ip domain-lookup | command turns off name-to-address translation in the router |
| If the name-to-address translation in the router is turned off | the router will not generate or forward name system broadcast packets |
| DNS (Domain Name Service) is enabled by default with a server address | 255.255.255.255, which is a local broadcast |
| show hosts | command is used to display a cached list of host names and addresses |
| Addressing problems | the most common problems that occur on IP networks |
| telnet | verifies the application layer software between source and destination stations; is the most complete testing mechanism available |
| ping | used to verify the hardware connection and the logical address at the internet layer; is a very basic testing mechanism |
| trace | uses TTL values to generate messages from each router used along the path |
| ping test return: ! | successful receipt of an echo reply |
| ping test return: . | timed out waiting for datagram reply |
| ping test return: U | destination unreachable error |
| ping test return: C | congestion-experienced packet |
| ping test return: I | ping interrupted |
| ping test return: ? | packet type unknown |
| interrupt ping | Ctrl-Shift-6 X |
| ping test return: & | packet TTL exceeded |
| The extended ping command is supported only from | privileged EXEC mode |
| When the trace reaches the target destination, a (n) | asterisk (*) is reported at the display |
| trace response: !H | The probe was received by the router, but not forwarded, usually due to an access list. |
| trace response: P | The protocol was unreachable |
| trace response: N | The network was unreachable |
| trace response: U | The port was unreachable |
| trace response: * | Time out |
