Chapter 4: Network Protocols and Routing
Which of the following is not a task handled by a router?
A router forwards broadcasts over the network.
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
By default, what is the MTU size on a typical Ethernet network?
1500 bytes
What is the Internet standard MTU?
1500 bytes
If the VLAN tag is present in an Ethernet frame, what is the maximum frame size?
1522 bytes
What IPv6 field is similar to the TTL field in IPv4 packets?
hop limit
A routing protocol's reliability and priority are rated by what measurement?
AD
Which routing protocol does an exterior router use to collect data to build its routing tables?
BGP
What field in a TCP segment is used to determine if an arriving data unit exactly matches the data unit sent by the source?
Checksum
What field in an IPv4 packet informs routers the level of precedence they should apply when processing an incoming packet?
Differentiated Services (DiffServ)
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
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.
IPv4 and IPv6 use the same packet format.
False
Routing Information Protocol (RIP) is an interior gateway protocol that uses a link-state algorithm.
False
UDP provides error checking, but not sequencing.
False
What is NOT one of the three characteristics of TCP in its role as a reliable delivery protocol?
Framing
When a router can't determine a path to a message's destination, where does it send the message?
Gateway of last resort
Which two protocols manage neighbor discovery processes on IPv4 networks?
ICMP and ARP
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 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.
Which OSI layer is responsible for directing data from one LAN to another?
Network layer
Which statement does NOT accurately describe characteristics of the OSPF protocol?
OSPF requires very little CPU or memory resources.
The IP connectionless protocol relies on what other protocol to guarantee delivery of data?
TCP
Which protocol's header would a Layer 4 device read and process?
TCP
In the event of a duplicate MAC address shared by two hosts on a switched network, what statement is accurate?
The hosts will still send and receive traffic, but traffic may not always reach the correct destination.
You are connected to your network's Cisco router, and need to verify the route table. What command should you enter?
show ip route
In a TCP segment, what field indicates how many bytes the sender can issue to a receiver before acknowledgment is received?
sliding-window
What tcpdump command can be used to filter out all traffic except SSH traffic?
tcpdump port 22
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
IP is an unreliable, connectionless protocol, as it does not establish a session to send its packets.
True
In general, a Layer 3 or Layer 4 switch is still optimized for fast Layer 2 data handling.
True
The Border Gateway Protocol is considered to be a hybrid routing protocol.
True
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 routing metric affects a path's potential performance due to delay?
latency
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
What utility is the equivalent to the pathping command on a Linux system?
mtr
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.
The cost of upgrading infrastructure has been a major factor in the slow adoption of IPv6.
True
Which command will produce statistics about each message transmitted by a host, separated according to protocol type?
netstat -s
What command will list only current connections, including IP addresses and port numbers?
netstat -n
At which OSI layer does IP operate?
Network layer
Which statement regarding the Border Gateway Protocol (BGP) is accurate?
BGP utilizes TCP for communicating updates.
What statement regarding the differences between the Windows tracert utility and the Linux/UNIX/macOS traceroute utility is accurate?
By default, the tracert utility uses ICMP echo requests, while traceroute uses UDP datagrams or TCP SYN messages.
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.
TCP uses a four-step process called a four-way handshake to establish a TCP connection.
False
The CTRL + S key combination can be used to stop an actively running command.
False
The pathping utility sends 10 pings per hop by default.
False
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 kind of route is created when a network administrator configures a router to use a specific path between nodes?
Static route