CCNA 1 Chapter v5.1 Answers 100%

Transcription

1 CCNA 1 Chapter v5.1 Answers 100% 1. What happens t runt frames received by a Cisc Ethernet switch? The frame is drpped. The frame is returned t the riginating netwrk device. The frame is bradcast t all ther devices n the same netwrk. The frame is sent t the default gateway. 2. What are the tw sizes (minimum and maximum) f an Ethernet frame? (Chse tw.) 56 bytes 64 bytes 128 bytes 1024 bytes 1518 bytes 3. What statement describes Ethernet? It defines the mst cmmn LAN type in the wrld. It is the required Layer 1 and 2 standard fr Internet cmmunicatin. It defines a standard mdel used t describe hw netwrking wrks. It cnnects multiple sites such as ruters lcated in different cuntries. 4. Which tw statements describe features r functins f the lgical link cntrl sublayer in Ethernet standards? (Chse tw.) Lgical link cntrl is implemented in sftware. Lgical link cntrl is specified in the IEEE standard. The LLC sublayer adds a header and a trailer t the data. The data link layer uses LLC t cmmunicate with the upper layers f the prtcl suite. The LLC sublayer is respnsible fr the placement and retrieval f frames n and ff the media. 5. What statement describes a characteristic f MAC addresses? They must be glbally unique. They are nly rutable within the private netwrk. They are added as part f a Layer 3 PDU. They have a 32-bit binary value. 6. Which statement is true abut MAC addresses? MAC addresses are implemented by sftware. A NIC nly needs a MAC address if cnnected t a WAN. The first three bytes are used by the vendr assigned OUI. The ISO is respnsible fr MAC addresses regulatins. CCNA 5 Page 1

2 7. Which destinatin address is used in an ARP request frame? FFFF.FFFF.FFFF E-00-AA What addressing infrmatin is recrded by a switch t build its MAC address table? the destinatin Layer 3 address f incming packets the destinatin Layer 2 address f utging frames the surce Layer 3 address f utging packets the surce Layer 2 address f incming frames 9. Refer t the exhibit. The exhibit shws a small switched netwrk and the cntents f the MAC address table f the switch. PC1 has sent a frame addressed t PC3. What will the switch d with the frame? CCNA1 Chapter 5 v The switch will discard the frame. The switch will frward the frame nly t prt 2. The switch will frward the frame t all prts except prt 4. The switch will frward the frame t all prts. The switch will frward the frame nly t prts 1 and Which switching methd uses the CRC value in a frame? CCNA 5 Page 2

3 cut-thrugh fast-frward fragment-free stre-and-frward 11. What is aut-mdix? a type f Cisc switch an Ethernet cnnectr type a type f prt n a Cisc switch a feature that detects Ethernet cable type 12. True r False? When a device is sending data t anther device n a remte netwrk, the Ethernet frame is sent t the MAC address f the default gateway. true false 13. The ARP table in a switch maps which tw types f address tgether? Layer 3 address t a Layer 2 address Layer 3 address t a Layer 4 address Layer 4 address t a Layer 2 address Layer 2 address t a Layer 4 address 14. Refer t the exhibit. PC1 issues an ARP request because it needs t send a packet t PC2. In this scenari, what will happen next? CCNA1 Chapter 5 v PC2 will send an ARP reply with its MAC address. RT1 will send an ARP reply with its Fa0/0 MAC address. CCNA 5 Page 3

4 RT1 will send an ARP reply with the PC2 MAC address. SW1 will send an ARP reply with the PC2 MAC address. SW1 will send an ARP reply with its Fa0/1 MAC address. 15. Refer t the exhibit. A switch with a default cnfiguratin cnnects fur hsts. The ARP table fr hst A is shwn. What happens when hst A wants t send an IP packet t hst D? CCNA1 Chapter 5 v Hst A sends an ARP request t the MAC address f hst D. Hst D sends an ARP request t hst A. Hst A sends ut the packet t the switch. The switch sends the packet nly t the hst D, which in turn respnds. Hst A sends ut a bradcast f FF:FF:FF:FF:FF:FF. Every ther hst cnnected t the switch receives the bradcast and hst D respnds with its MAC address. 16. Refer t the exhibit. The switches are in their default cnfiguratin. Hst A needs t cmmunicate with hst D, but hst A des nt have the MAC address fr its default gateway. Which netwrk hsts will receive the ARP request sent by hst A? CCNA 5 Page 4

5 CCNA1 Chapter 5 v nly hst D nly ruter R1 nly hsts A, B, and C nly hsts A, B, C, and D nly hsts B and C nly hsts B, C, and ruter R1 17. Which statement describes the treatment f ARP requests n the lcal link? They must be frwarded by all ruters n the lcal netwrk. They are received and prcessed by every device n the lcal netwrk. They are drpped by all switches n the lcal netwrk. They are received and prcessed nly by the target device. 18. What are tw ptential netwrk prblems that can result frm ARP peratin? (Chse tw.) Manually cnfiguring static ARP assciatins culd facilitate ARP pisning r MAC address spfing. On large netwrks with lw bandwidth, multiple ARP bradcasts culd cause data cmmunicatin delays. Netwrk attackers culd manipulate MAC address and IP address mappings in ARP messages with the intent f intercepting netwrk traffic. Large numbers f ARP request bradcasts culd cause the hst MAC address table t verflw and prevent the hst frm cmmunicating n the netwrk. Multiple ARP replies result in the switch MAC address table cntaining entries that match the MAC addresses f hsts that are cnnected t the relevant switch prt. CCNA 5 Page 5

6 19. Fill in the blank. A cllisin fragment, als knwn as a RUNT frame, is a frame f fewer than 64 bytes in length. 20. Fill in the blank. On a Cisc switch, prt-based memry buffering is used t buffer frames in queues linked t specific incming and utging prts. 21. Fill in the blank. ARP spfing is a technique that is used t send fake ARP messages t ther hsts in the LAN. The aim is t assciate IP addresses t the wrng MAC addresses. 22. Match the characteristic t the frwarding methd. (Nt all ptins are used.) Questin CCNA1 Chapter 5 v Questin Answer CCNA 5 Page 6

7 CCNA1 Chapter 5 v Answer CCNA 5 Page 7