Ch 4: Network Protocols and Routing Flashcards
What is NOT one of the three characteristics of TCP in its role as a reliable delivery protocol?
Framing
What field in an IPv4 packet informs routers the level of precedence they should apply when processing an incoming packet?
Differentiated Services (DiffServ)
What command will list only current connections, including IP addresses and port numbers?
netstat -n
What utility is the equivalent to the pathping command on a Linux system?
mtr
Which statement regarding the Border Gateway Protocol (BGP) is accurate?
BGP utilizes TCP for communicating updates.
In a TCP segment, what field indicates how many bytes the sender can issue to a receiver before acknowledgment is received?
sliding-window
Which of the following is not a task handled by a router?
A router forwards broadcasts over the network.
The IP connectionless protocol relies on what other protocol to guarantee delivery of data?
TCP
You are connected to your network’s Cisco router, and need to verify the route table. What command should you enter?
show ip route
Which traceroute command will perform a trace using ICMP echo requests instead of UDP datagrams to the host srv1.mycompany.com?
traceroute -I srv1.mycompany.com
What is the purpose of the checksum TCP field?
It allows the receiving node to determine whether the TCP segment became corrupted during transmission.
What happens when a router receives a packet with a TTL of 0?
The router drops the packet and sends an ICMP TTL expired message back to the host.
In IPv6, what field is used to indicate what sequence of packets from one source to one or multiple destinations a packet belongs to?
flow label
What is routing protocol convergence time defined as?
It is the time it takes for the protocol to recognize the best path in the event of a network change.
Routing protocols that enable routers to communicate beyond neighboring routers, allowing each router to independently map the network, are known as which type of protocols?
link-state protocols
Which routing protocol started as a Cisco proprietary protocol and combines some of the features of a link-state protocol with that of distance-vector protocols?
EIGRP
You have been tasked with the replacement of OSPF with EIGRP throughout your organization, which consists of a mixture of Cisco routers and routers from other vendors. What statement is accurate?
EIGRP may not be available on non-Cisco routers.
What tcpdump command can be used to filter out all traffic except SSH traffic?
tcpdump port 22
Which command will produce statistics about each message transmitted by a host, separated according to protocol type?
netstat -s
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?
15
What occurs when a collision happens on a network?
Each node on the network waits a random amount of time and then resends the transmission.
You have been tasked with maintaining a network that is jumbo frame enabled. What does this mean?
The MTU for the network can be as high as 9198 bytes.
What IPv6 field is similar to the TTL field in IPv4 packets?
hop limit
If the VLAN tag is present in an Ethernet frame, what is the maximum frame size?
1522 bytes
