Networking + CH4
The router drops the packet and sends an ICMP TTL expired message back to the host.
What happens when a router receives a packet with a TTL of 0? A. The router attempts to forward the traffic on a local network. B. The router marks the packet as corrupted and forwards it to the next hop. C. The router resets the TTL to 128. D. The router drops the packet and sends an ICMP TTL expired message back to the host.
True
In general, a Layer 3 or Layer 4 switch is still optimized for fast Layer 2 data handling. True False
False
Routing Information Protocol (RIP) is an interior gateway protocol that uses a link-state algorithm. True False
True
The cost of upgrading infrastructure has been a major factor in the slow adoption of IPv6. True False
False
UDP provides error checking, but not sequencing. True False
True
IP is an unreliable, connectionless protocol, as it does not establish a session to send its packets. True False
False
IPv4 and IPv6 use the same packet format. True False
False
TCP uses a four-step process called a four-way handshake to establish a TCP connection. True False
True
The Border Gateway Protocol is considered to be a hybrid routing protocol. True False
False
The CTRL + S key combination can be used to stop an actively running command. True False
TCP
The IP connectionless protocol relies on what other protocol to guarantee delivery of data? A. TCP B. ARP C. UDP D. ICMP
False
The pathping utility sends 10 pings per hop by default. True False
It is the time it takes for the protocol to recognize the best path in the event of a network change.
What is routing protocol convergence time defined as? A. It is the amount of time involved in configuration of the routing protocol. B. It is the amount of time it takes after initial configuration of the protocol for all routes to become known. C. It is the time it takes for the protocol to recognize that a change has occurred. D. It is the time it takes for the protocol to recognize the best path in the event of a network change.
Each node on the network waits a random amount of time and then resends the transmission.
What occurs when a collision happens on a network? A. Each node on the network stops transmitting, until manually told to reconnect and transmit. B. Each node on the network waits a random amount of time and then resends the transmission. C. The collision will create an error in the network switch, but otherwise, no issues will occur as a result. D. The collision goes undetected, and data transmission continues.
By default, the tracert utility uses ICMP echo requests, while traceroute uses UDP datagrams or TCP SYN messages.
What statement regarding the differences between the Windows tracert utility and the Linux/UNIX/macOS traceroute utility is accurate? A. Only tracert can send UDP messages for tracing a path. B. The Windows tracert utility does not place limits on the TTL of repeated trial messages. C. By default, the tracert utility uses ICMP echo requests, while traceroute uses UDP datagrams or TCP SYN messages. D. The tracert utility expects an ICMP port unreachable error message as the final reply to a trace.
tcpdump port 22
What tcpdump command can be used to filter out all traffic except SSH traffic? A. tcpdump -f +ssh B. tcpdump port 22 C. tcpdump only ssh D. tcpdump -p 22
15
When using the Routing Information Protocol (RIP), what is the maximum number of hops a message can take between its source and its destination before the destination is considered unreachable? A. 20 B. 8 C. 32 D. 15
netstat -s
Which command will produce statistics about each message transmitted by a host, separated according to protocol type? A. netstat -an B. netstat -s C. ipstat -a D. ipconfig -s
A router forwards broadcasts over the network.
Which of the following is not a task handled by a router? A. A router can interpret Layer 3 and often Layer 4 addressing. B. A router can connect dissimilar networks. C. A router can reroute traffic if the path of first choice is down but a second path is available. D. A router forwards broadcasts over the network.
show ip route
You are connected to your network's Cisco router, and need to verify the route table. What command should you enter? A.route print B. route -a C. show ip route D. show route-table