Module 4

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 will increase CPU utilization on core routers. Increased traffic will result from the switch to EIGRP. EIGRP may not be available on non-Cisco routers. Convergence time will be increased with EIGRP.

EIGRP may not be available on non-Cisco routers.

UDP provides error checking, but not sequencing. False True

False

What is NOT one of the three characteristics of TCP in its role as a reliable delivery protocol? Flow Control Sequencing and checksums Connection-oriented Protocol Framing

Framing

Which of the following is not a task handled by a router? A router can interpret Layer 3 and often Layer 4 addressing. A router can connect dissimilar networks. A router can reroute traffic if the path of first choice is down but a second path is available. A router forwards broadcasts over the network.

A router forwards broadcasts over the network.

Which statement regarding the Border Gateway Protocol (BGP) is accurate? BGP is limited to a single autonomous system. BGP is exclusively a distance-vector protocol. BGP utilizes TCP for communicating updates. BGP is a more advanced version of OSPF.

BGP utilizes TCP for communicating updates.

What field in an IPv4 packet informs routers the level of precedence they should apply when processing an incoming packet? Differentiated Services (DiffServ) Internet header length (IHL) Padding Time to Live (TTL)

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? BGP OSPF EIGRP IS-IS

EIGRP

What routing metric affects a path's potential performance due to delay? latency theoretical bandwidth MTU load

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 border gateway protocols interior gateway protocols distance vector protocols

link-state protocols

What utility is the equivalent to the pathping command on a Linux system? mtr hping traceroute tracepath

mtr

What command will list only current connections, including IP addresses and port numbers? netstat -s portstat show ip stats netstat -n

netstat -n

Which command will produce statistics about each message transmitted by a host, separated according to protocol type? ipconfig -s netstat -an ipstat -a netstat -s

netstat -s

You are connected to your network's Cisco router, and need to verify the route table. What command should you enter? show route-table route print show ip route route -a

show ip route

In a TCP segment, what field indicates how many bytes the sender can issue to a receiver before acknowledgment is received? urgent pointer sliding-window PSH flag URG flag

sliding-window

What tcpdump command can be used to filter out all traffic except SSH traffic? tcpdump -p 22 tcpdump only ssh tcpdump port 22 tcpdump -f +ssh

tcpdump port 22

The Border Gateway Protocol is considered to be a hybrid routing protocol. False True

True

The cost of upgrading infrastructure has been a major factor in the slow adoption of IPv6. True False

True

The pathping utility sends 10 pings per hop by default. False True

False

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? 8 15 20 32

15

By default, what is the MTU size on a typical Ethernet network? 1500 bytes 1492 bytes 1522 bytes 1518 bytes

1500 bytes

If the VLAN tag is present in an Ethernet frame, what is the maximum frame size? 1500 bytes 1518 bytes 1492 bytes 1522 bytes

1522 bytes

Originally codified by ISO, what does the "intermediate system" in IS-IS (Intermediate System to Intermediate System) stand for? An entire network consisting of various network devices. The administrative boundaries of an organization. An IS-IS capable network router. The autonomous systems used by an organization.

An IS-IS capable network router.

What statement regarding the differences between the Windows tracert utility and the Linux/UNIX/macOS traceroute utility is accurate? Only tracert can send UDP messages for tracing a path. The tracert utility expects an ICMP port unreachable error message as the final reply to a trace. The Windows tracert utility does not place limits on the TTL of repeated trial messages. By default, the tracert utility uses ICMP echo requests, while traceroute uses UDP datagrams or TCP SYN messages.

By default, the tracert utility uses ICMP echo requests, while traceroute uses UDP datagrams or TCP SYN messages.

What occurs when a collision happens on a network? Each node on the network stops transmitting, until manually told to reconnect and transmit. Each node on the network waits a random amount of time and then resends the transmission. The collision will create an error in the network switch, but otherwise, no issues will occur as a result. The collision goes undetected, and data transmission continues.

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 True

False

Routing Information Protocol (RIP) is an interior gateway protocol that uses a link-state algorithm. False True

False

TCP uses a four-step process called a four-way handshake to establish a TCP connection. True False

False

What is the purpose of the checksum TCP field? It confirms receipt of data via a return message to the sender. It specifies special options, such as the maximum segment size a network can handle. It identifies the data segment's position in the stream of data segments being sent. It allows the receiving node to determine whether the TCP segment became corrupted during transmission.

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 amount of time it takes after initial configuration of the protocol for all routes to become known. It is the amount of time involved in configuration of the routing protocol. It is the time it takes for the protocol to recognize the best path in the event of a network change. It is the time it takes for the protocol to recognize that a change has occurred.

It is the time it takes for the protocol to recognize the best path in the event of a network change.

Which statement does NOT accurately describe characteristics of the OSPF protocol? OSPF provides low network overhead. OSPF has no hop limits on a transmission path. OSPF requires very little CPU or memory resources. OSPF maintains a database of other routers' links.

OSPF requires very little CPU or memory resources.

The IP connectionless protocol relies on what other protocol to guarantee delivery of data? TCP ICMP UDP ARP

TCP

In general, a Layer 3 or Layer 4 switch is still optimized for fast Layer 2 data handling. False True

True

You have been tasked with maintaining a network that is jumbo frame enabled. What does this mean? Fragmented frames will be consolidated into whole frames before being sent. The network is not based on the Ethernet standard. The MTU for the network can be as high as 9198 bytes. The MTU for the network is set at 65,535 bytes.

The MTU for the network can be as high as 9198 bytes.

In the event of a duplicate MAC address shared by two hosts on a switched network, what statement is accurate? The network switch will eventually crash due to being unable to properly forward traffic. The hosts that share the same MAC addresses will be completely unable to communicate with any other devices. The hosts will generate new MAC addresses until the conflict is resolved. The hosts will still send and receive traffic, but traffic may not always reach the correct destination.

The hosts will still send and receive traffic, but traffic may not always reach the correct destination.

What happens when a router receives a packet with a TTL of 0? The router attempts to forward the traffic on a local network. The router drops the packet and sends an ICMP TTL expired message back to the host. The router resets the TTL to 128. The router marks the packet as corrupted and forwards it to the next hop.

The router drops the packet and sends an ICMP TTL expired message back to the host.

IP is an unreliable, connectionless protocol, as it does not establish a session to send its packets. False True

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? group ID traffic class flow label traffic exchange

flow label

What IPv6 field is similar to the TTL field in IPv4 packets? next header distance vector hop limit flow label

hop limit

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 traceroute -w srv1.mycompany.com traceroute -o ICMP srv1.mycompany.com traceroute -i srv1.mycompany.com

traceroute -I srv1.mycompany.com