Chapter 13
Which utility uses the Internet Control Messaging Protocol (ICMP)?
-ping
Which two things can be determined by using the ping command? (Choose two.)
-the average time it takes a packet to reach the destination and for the response to return to the source. -the destination device is reachable through the network.
A network administrator can successfully ping the server at www.cisco.com, but cannot ping the company web server located at an ISP in another city. Which tool or command would help identify the specific router where the packet was lost or delayed?
traceroute
A technician is troubleshooting a network where it is suspected that a defective node in the network path is causing packets to be dropped. The technician only has the IP address of the end point device and does not have any details of the intermediate devices. What command can the technician use to identify the faulty node?
tracert
ICMP Messages
-TCP/IP suite provides for error messages and informational messages sent using ICMP when communicating with another IP device. -ICMP messages common to IPv4 and IPv6 is: Host reachability, Destination or Service Unreachable, time exceeded.
Which command can be used to test connectivity between two devices using echo request and echo reply messages?
ping
Which protocol is used by IPv4 and IPv6 to provide error messaging?
-ICMP
A network administrator is testing network connectivity by issuing the ping command on a router. Which symbol will be displayed to indicate that a time expired during the wait for an ICMP echo reply message?
.
Which ICMP message is used by the traceroute utility during the process of finding the path between two end hosts?
time exceeded
What message is sent by a host to check the uniqueness of an IPv6 address before using that address?
NS neighbor solicitation
A user calls to report that a PC cannot access the internet. The network technician asks the user to issue the command ping 127.0.0.1 in a command prompt window. The user reports that the result is four positive replies. What conclusion can be drawn based on this connectivity test?
-The TCP/IP implementation is functional.
What is a function of the tracert command that differs from the ping command when they are used on a workstation?
-The tracert command shows the information of routers in the path.
What field content is used by ICMPv6 to determine that a packet has expired?
Hop Limit field
Which protocol provides feedback from the destination host to the source host about errors in packet delivery?
ICMP
A user who is unable to connect to the file server contacts the help desk. The helpdesk technician asks the user to ping the IP address of the default gateway that is configured on the workstation. What is the purpose for this ping command?
-To test that the host has the capability to reach hosts on other networks.
Ping and Traceroute Testing
-Uses ICMP echo requests and echo reply messages to test connectivity between hosts. Can be used to test internal configuration of hosts. -A successful ping to the default gateway will indicate both the router and host are operational.
